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Water
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{{short description|chemical compound}}{{about|general aspects of water|a detailed discussion of its physical and chemical properties|Properties of water|other uses}}{{pp-move-indef}}{{Use dmy dates|date=January 2018}}{{pp-semi-vandalism|small=yes}}File:Iceberg with hole near Sandersons Hope 2007-07-28 2.jpg|thumb|Water in two states: liquid (including the clouds, which are examples of aerosols), and solid (iceiceWater is the transparent, tasteless, odorless, and nearly colorless chemical substance that is the main constituent of Earth's streams, lakes, and oceans, and the fluids of most living organisms, and that is vital for all known forms of life, even though it provides no calories or organic nutrients. Its chemical formula is H2O, meaning that each of its molecules contains one oxygen and two hydrogen atoms connected by covalent bonds. Water is the name of the liquid state of H2O at standard ambient temperature and pressure. It forms precipitation in the form of rain and aerosols in the form of fog. Clouds are formed from suspended droplets of water and ice, its solid state. When finely divided, crystalline ice may precipitate in the form of snow. The gaseous state of water is steam or water vapor. Water moves continually through the water cycle of evaporation, transpiration (evapotranspiration), condensation, precipitation, and runoff, usually reaching the sea. Water covers 71% of the Earth's surface, mostly in seas and oceans.WEB,weblink CIA – The world facctbook, Central Intelligence Agency, 20 December 2008, Small portions of water occur as groundwater (1.7%), in the glaciers and the ice caps of Antarctica and Greenland (1.7%), and in the air as vapor, clouds (formed of ice and liquid water suspended in air), and precipitation (0.001%).BOOK, Water in Crisis: A Guide to the World's Freshwater Resources, Gleick, P.H., Oxford University Press, 1993, 13, Table 2.1 "Water reserves on the earth",weblink yes,weblink" title="web.archive.org/web/20130408091921weblink">weblink 8 April 2013, dmy-all, Water Vapor in the Climate System, Special Report, [AGU], December 1995 (linked 4/2007). Vital Water UNEP. {{webarchive |url=https://web.archive.org/web/20090708023755weblink |date=8 July 2009 }} Water plays an important role in the world economy. Approximately 70% of the freshwater used by humans goes to agriculture.JOURNAL, Baroni, L., Cenci, L., Tettamanti, M., Berati, M., 2007, Evaluating the environmental impact of various dietary patterns combined with different food production systems, European Journal of Clinical Nutrition, 61, 279–286, 10.1038/sj.ejcn.1602522, 17035955, 2, Fishing in salt and fresh water bodies is a major source of food for many parts of the world. Much of long-distance trade of commodities (such as oil and natural gas) and manufactured products is transported by boats through seas, rivers, lakes, and canals. Large quantities of water, ice, and steam are used for cooling and heating, in industry and homes. Water is an excellent solvent for a wide variety of chemical substances; as such it is widely used in industrial processes, and in cooking and washing. Water is also central to many sports and other forms of entertainment, such as swimming, pleasure boating, boat racing, surfing, sport fishing, and diving.

Etymology

The word "water" comes from Old English "wæter", from Proto-Germanic "*watar" (source also of Old Saxon "watar", Old Frisian "wetir", Dutch "water", Old High German "wazzar", German "Wasser", Old Norse "vatn", Gothic "wato"), from Proto-Indoeuropean "*wod-or", suffixed form of root "*wed-" ("water"; "wet")WEB,weblink Water (v.), www.etymonline.com, Online Etymology Dictionary, 20 May 2017, .

Chemical and physical properties

{{see also||Water (data page)|Water model}}Water ({{chem|H|2|O}}) is a polar inorganic compound that is at room temperature a tasteless and odorless liquid, nearly colorless with a hint of blue. This simplest hydrogen chalcogenide is by far the most studied chemical compound and is described as the "universal solvent" for its ability to dissolve many substances.{{Greenwood&Earnshaw2nd|page=620}}WEB, Water, the Universal Solvent,weblink USGS, This allows it to be the "solvent of life".BOOK, Campbell Biology, Reece, Jane B., 31 October 2013, Pearson Education, Pearson, 9780321775658, 10, 48, It is the only common substance to exist as a solid, liquid, and gas in normal terrestrial conditions.BOOK, Campbell Biology, Reece, Jane B., 31 October 2013, Pearson Education, Pearson, 9780321775658, 10, 44,

States

{{Refimprove section|date=May 2018}}File:SnowflakesWilsonBentley.jpg|thumb|right|Snowflakes by Wilson BentleyWilson Bentley(File:Brindis (24675281395).jpg|thumb|left|Liquid water, showing droplets and air bubbles caused by the drops)Water is a liquid at the temperatures and pressures that are most adequate for life. Specifically, at a standard pressure of 1 atm, water is a liquid between {{convert|0|and|100|C}}. Increasing the pressure slightly lowers the melting point, which is about {{convert|-5|C}} at 600 atm and {{convert|-22|C}} at 2100 atm. This effect is relevant, for example, to ice skating, to the buried lakes of Antarctica, and to the movement of glaciers. (At pressures higher than 2100 atm the melting point rapidly increases again, and ice takes several exotic forms that do not exist at lower pressures.)Increasing the pressure has a more dramatic effect on the boiling point, that is about {{convert|374|C}} at 220 atm. This effect is important in, among other things, deep-sea hydrothermal vents and geysers, pressure cooking, and steam engine design. At the top of Mount Everest, where the atmospheric pressure is about 0.34 atm, water boils at {{convert|68|C}}.At very low pressures (below about 0.006 atm), water cannot exist in the liquid state and passes directly from solid to gas by sublimation—a phenomenon exploited in the freeze drying of food. At very high pressures (above 221 atm), the liquid and gas states are no longer distinguishable, a state called supercritical steam.Water also differs from most liquids in that it becomes less dense as it freezes. The maximum density of water in its liquid form (at 1 atm) is {{convert|1000|kg/m3|lb/cuft|sigfig=4|abbr=on}}; that occurs at {{convert|3.98|°C}}.NEWS,weblink Water: Water—an enduring mystery, 15 November 2016, Nature, The density of ice is {{convert|917|kg/m3|lb/cuft|sigfig=4|abbr=on}}.BOOK, Kotz, J. C., Treichel, P., & Weaver, G. C., 2005, Chemistry & Chemical Reactivity, Thomson Brooks/Cole, 0-534-39597-X, BOOK, Ben-Naim, Ariel, etal, Alice's Adventures in Water-land, 2011, Singapore, 10.1142/8068, Ben-Naim, Roberta, 978-981-4338-96-7, Thus, water expands 9% in volume as it freezes, which accounts for the fact that ice floats on liquid water.The details of the exact chemical nature of liquid water are not well understood; some theories suggest that water's unusual behaviour is as a result of it having 2 liquid states.JOURNAL, Maestro, L.m., Marqués, M.i., Camarillo, E., Jaque, D., Solé, J. García, Gonzalo, J.a., Jaque, F., Valle, Juan C. Del, Mallamace, F., 1 January 2016, On the existence of two states in liquid water: impact on biological and nanoscopic systems,weblink International Journal of Nanotechnology, 13, 8–9, 667–677, 10.1504/IJNT.2016.079670, 2016IJNT...13..667M, JOURNAL, Francesco, Mallamace, Carmelo, Corsaro, H. Eugene, Stanley, A singular thermodynamically consistent temperature at the origin of the anomalous behavior of liquid water, Scientific Reports, 18 December 2012, 2, 1, 993, 10.1038/srep00993, 2012NatSR...2E.993M, JOURNAL, Perakis, Fivos, Amann-Winkel, Katrin, Lehmkühler, Felix, Sprung, Michael, Mariedahl, Daniel, Sellberg, Jonas A., Pathak, Harshad, Späh, Alexander, Cavalca, Filippo, Ricci, Alessandro, Jain, Avni, Massani, Bernhard, Aubree, Flora, Benmore, Chris J., Loerting, Thomas, Grübel, Gerhard, Pettersson, Lars G. M., Nilsson, Anders, 26 June 2017, Diffusive dynamics during the high-to-low density transition in amorphous ice, Proceedings of the National Academy of Sciences of the United States of America, 13, 8–9, 667–677, 10.1073/pnas.1705303114, 5547632, 28652327,

Taste and odor

Pure water is usually described as tasteless and odorless, although humans have specific sensors that can feel the presence of water in their mouths,Edmund T. Rolls (2005), "Emotion Explained". Oxford University Press, Medical. {{ISBN|0198570031}}, 9780198570035. and frogs are known to be able to smell it.R. Llinas, W. Precht (2012), "Frog Neurobiology: A Handbook". Springer Science & Business Media. {{ISBN|3642663168}}, 9783642663161 However, water from ordinary sources (including bottled mineral water) usually has many dissolved substances, that may give it varying tastes and odors. Humans and other animals have developed senses that enable them to evaluate the potability of water by avoiding water that is too salty or putrid.JOURNAL, Candau, Joël, 2004, The Olfactory Experience: constants and cultural variables,weblink Water Science and Technology, 49, 9, 11–17,

Color and appearance

The apparent color of natural bodies of water (and swimming pools) is often determined more by dissolved and suspended solids, or by reflection of the sky, than by water itself.Light in the visible electromagnetic spectrum can traverse a couple meters of pure water (or ice) without significant absorption, so that it looks transparent and colorless.JOURNAL, Braun, Charles L., Sergei N. Smirnov, Why is water blue?, J. Chem. Educ., 70, 8, 612, 1993,weblink 10.1021/ed070p612, 1993JChEd..70..612B, Thus aquatic plants, algae, and other photosynthetic organisms can live in water up to hundreds of meters deep, because sunlight can reach them. Water vapour is essentially invisible as a gas.Through a thickness of {{convert|10|m|sp=us}} or more, however, the intrinsic color of water (or ice) is visibly turquoise (greenish blue), as its absorption spectrum has a sharp minimum at the corresponding color of light (1/227 m−1 at 418 nm). The color becomes increasingly stronger and darker with increasing thickness. (Practically no sunlight reaches the parts of the oceans below {{convert|1000|m|sp=us}} of depth.) Infrared and ultraviolet light, on the other hand, is strongly absorbed by water.The refraction index of liquid water (1.333 at {{convert|20|C}}) is much higher than that of air (1.0), similar to those of alkanes and ethanol, but lower than those of glycerol (1.473), benzene (1.501), carbon disulfide (1.627), and common types of glass (1.4 to 1.6). The refraction index of ice (1.31) is lower than that of liquid water.

Polarity and hydrogen bonding

{{See also|Chemical bonding of H2O}}File:3D model hydrogen bonds in water.svg|left|thumb|Model of hydrogen bondhydrogen bondFile:Capillarity.svg|upright|thumb|Capillary action of water compared to mercury.]]File:Water drop 001.jpg|right|thumb|Impact from a water drop causes an upward "rebound" jet surrounded by circular capillary wavecapillary waveSince the water molecule is not linear and the oxygen atom has a higher electronegativity than hydrogen atoms, it is a polar molecule, with an electrical dipole moment: the oxygen atom carries a slight negative charge, whereas the hydrogen atoms are slightly positive. Water is a good polar solvent, that dissolves many salts and hydrophilic organic molecules such as sugars and simple alcohols such as ethanol. Most acids dissolve in water to yield the corresponding anions. Many substances in living organisms, such as proteins, DNA and polysaccharides, are dissolved in water. Water also dissolves many gases, such as oxygen and carbon dioxide—the latter giving the fizz of carbonated beverages, sparkling wines and beers.On the other hand, many organic substances (such as fats and oils and alkanes) are hydrophobic, that is, insoluble in water. Many inorganic substances are insoluble too, including most metal oxides, sulfides, and silicates.Because of its polarity, a molecule of water in the liquid or solid state can form up to four hydrogen bonds with neighboring molecules. These bonds are the cause of water's high surface tensionBOOK, Campbell, Neil A., Brad Williamson, Robin J. Heyden, Biology: Exploring Life, Pearson Prentice Hall, 2006, Boston, Massachusetts,weblink 0-13-250882-6, and capillary forces. The capillary action refers to the tendency of water to move up a narrow tube against the force of gravity. This property is relied upon by all vascular plants, such as trees.Capillary Action – Liquid, Water, Force, and Surface – JRank Articles. Science.jrank.org. Retrieved on 28 September 2015.The hydrogen bonds are also the reason why the melting and boiling points of water are much higher than those of other analogous compounds like hydrogen sulfide ({{chem|H|2|S}}). They also explain its exceptionally high specific heat capacity (about 4.2 J/g/K), heat of fusion (about 333 J/g), heat of vaporization ({{nowrap|2257 J/g}}), and thermal conductivity (between 0.561 and 0.679 W/m/K). These properties make water more effective at moderating Earth's climate, by storing heat and transporting it between the oceans and the atmosphere. The hydrogen bonds of water are of moderate strength, around 23 kJ/mol (compared to a covalent O-H bond at 492 kJ/mol). Of this, it is estimated that 90% of the hydrogen bond is attributable to electrostatics, while the remaining 10% reflects partial covalent character.JOURNAL, 1 March 2000, Compton scattering evidence for covalency of the hydrogen bond in ice, Journal of Physics and Chemistry of Solids, 61, 3, 403–406, 10.1016/S0022-3697(99)00325-X, Isaacs, E.D, Shukla, A, Platzman, P.M, Hamann, D.R, Barbiellini, B, Tulk, C.A, 2000JPCS...61..403I,

Electrical conductivity and electrolysis

Pure water has a low electrical conductivity, which increases with the dissolution of a small amount of ionic material such as common salt.Liquid water can be split into the elements hydrogen and oxygen by passing an electric current through it—a process called electrolysis. The decomposition requires more energy input than the heat released by the inverse process (285.8 kJ/mol, or 15.9 MJ/kg).WEB, Ball, Philip, Philip Ball, Burning water and other myths,weblink Nature (journal), Nature News, 14 September 2007, 14 September 2007,

Mechanical properties

Liquid water can be assumed to be incompressible for most purposes: its compressibility ranges from 4.4 to {{val|5.1|e=-10|u=Pa−1}} in ordinary conditions.JOURNAL, Fine, R.A., Millero, F.J., yes, 1973, Compressibility of water as a function of temperature and pressure, 59, 10, 5529, Journal of Chemical Physics, 10.1063/1.1679903, 1973JChPh..59.5529F, Even in oceans at 4 km depth, where the pressure is 400 atm, water suffers only a 1.8% decrease in volume.WEB, Bulk Elastic Properties, Nave, R., HyperPhysics, Georgia State University,weblink 26 October 2007, The viscosity of water is about 10−3 Pa·s or 0.01 poise at {{convert|20|C}}, and the speed of sound in liquid water ranges between {{convert|1400|and|1540|m/s|sp=us}} depending on temperature. Sound travels long distances in water with little attenuation, especially at low frequencies (roughly 0.03 dB/km for 1 kHz), a property that is exploited by cetaceans and humans for communication and environment sensing (sonar).UK National Physical Laboratory, Calculation of absorption of sound in seawater. Online site, last accessed on 28 September 2016.

Reactivity

Elements which are more electropositive than hydrogen such as lithium, sodium, calcium, potassium and caesium displace hydrogen from water, forming hydroxides and releasing hydrogen.

On Earth

File:The Earth seen from Apollo 17.jpg|thumb|Water covers 71% of the Earth's surface; the oceans contain 96.5% of the Earth's water. The Antarctic ice sheet, which contains 61% of all fresh water on Earth, is visible at the bottom. Condensed atmospheric water can be seen as clouds, contributing to the Earth's albedoalbedoHydrology is the study of the movement, distribution, and quality of water throughout the Earth. The study of the distribution of water is hydrography. The study of the distribution and movement of groundwater is hydrogeology, of glaciers is glaciology, of inland waters is limnology and distribution of oceans is oceanography. Ecological processes with hydrology are in focus of ecohydrology.The collective mass of water found on, under, and over the surface of a planet is called the hydrosphere. Earth's approximate water volume (the total water supply of the world) is {{convert|1.338|e9km3|e6mi3|sp=us}}.Liquid water is found in bodies of water, such as an ocean, sea, lake, river, stream, canal, pond, or puddle. The majority of water on Earth is sea water. Water is also present in the atmosphere in solid, liquid, and vapor states. It also exists as groundwater in aquifers.Water is important in many geological processes. Groundwater is present in most rocks, and the pressure of this groundwater affects patterns of faulting. Water in the mantle is responsible for the melt that produces volcanoes at subduction zones. On the surface of the Earth, water is important in both chemical and physical weathering processes. Water, and to a lesser but still significant extent, ice, are also responsible for a large amount of sediment transport that occurs on the surface of the earth. Deposition of transported sediment forms many types of sedimentary rocks, which make up the geologic record of Earth history.

Water cycle

File:Water cycle.png|thumb|Water cycleWater cycleThe water cycle (known scientifically as the hydrologic cycle) refers to the continuous exchange of water within the hydrosphere, between the atmosphere, soil water, surface water, groundwater, and plants.Water moves perpetually through each of these regions in the water cycle consisting of following transfer processes:
  • evaporation from oceans and other water bodies into the air and transpiration from land plants and animals into air.
  • precipitation, from water vapor condensing from the air and falling to earth or ocean.
  • runoff from the land usually reaching the sea.
Most water vapor over the oceans returns to the oceans, but winds carry water vapor over land at the same rate as runoff into the sea, about 47 Tt per year. Over land, evaporation and transpiration contribute another 72 Tt per year. Precipitation, at a rate of 119 Tt per year over land, has several forms: most commonly rain, snow, and hail, with some contribution from fog and dew.BOOK, Water in Crisis: A Guide to the World's Freshwater Resources, Gleick, P.H., Oxford University Press, 1993, 15, Table 2.3,weblink yes,weblink" title="web.archive.org/web/20130408091921weblink">weblink 8 April 2013, dmy-all, Dew is small drops of water that are condensed when a high density of water vapor meets a cool surface. Dew usually forms in the morning when the temperature is the lowest, just before sunrise and when the temperature of the earth's surface starts to increase.BOOK, Alice's Adventures in Water-land, Ben-Naim, A., Ben-Naim, R., P.H., yes, World Scientific Publishing, 2011, 31, 10.1142/8068, 978-981-4338-96-7, Condensed water in the air may also refract sunlight to produce rainbows.Water runoff often collects over watersheds flowing into rivers. A mathematical model used to simulate river or stream flow and calculate water quality parameters is a hydrological transport model. Some water is diverted to irrigation for agriculture. Rivers and seas offer opportunity for travel and commerce. Through erosion, runoff shapes the environment creating river valleys and deltas which provide rich soil and level ground for the establishment of population centers. A flood occurs when an area of land, usually low-lying, is covered with water. It is when a river overflows its banks or flood comes from the sea. A drought is an extended period of months or years when a region notes a deficiency in its water supply. This occurs when a region receives consistently below average precipitation.

Fresh water storage

{{multiple image|perrow = 1|total_width=150
width1=|height1=width2=|height2=| footer = The Bay of Fundy at high tide (left) and low tide (right)}}Some runoff water is trapped for periods of time, for example in lakes. At high altitude, during winter, and in the far north and south, snow collects in ice caps, snow packs and glaciers. Water also infiltrates the ground and goes into aquifers. This groundwater later flows back to the surface in springs, or more spectacularly in hot springs and geysers. Groundwater is also extracted artificially in wells. This water storage is important, since clean, fresh water is essential to human and other land-based life. In many parts of the world, it is in short supply.

Sea water and tides

Sea water contains about 3.5% sodium chloride on average, plus smaller amounts of other substances. The physical properties of sea water differ from fresh water in some important respects. It freezes at a lower temperature (about {{convert|-1.9|C}}) and its density increases with decreasing temperature to the freezing point, instead of reaching maximum density at a temperature above freezing. The salinity of water in major seas varies from about 0.7% in the Baltic Sea to 4.0% in the Red Sea. (The Dead Sea, known for its ultra-high salinity levels of between 30–40%, is really a salt lake.)Tides are the cyclic rising and falling of local sea levels caused by the tidal forces of the Moon and the Sun acting on the oceans. Tides cause changes in the depth of the marine and estuarine water bodies and produce oscillating currents known as tidal streams. The changing tide produced at a given location is the result of the changing positions of the Moon and Sun relative to the Earth coupled with the effects of Earth rotation and the local bathymetry. The strip of seashore that is submerged at high tide and exposed at low tide, the intertidal zone, is an important ecological product of ocean tides.

Effects on life

File:Oasis in Lybia.JPG|thumb|left|An oasis is an isolated water source with vegetation in a desertdesertFile:Auto-and heterotrophs.svg|thumb|right|Overview of photosynthesis and respiration. Water (at right), together with carbon dioxide (CO2), form oxygen and organic compounds (at left), which can be respired to water and (CO2).]]From a biological standpoint, water has many distinct properties that are critical for the proliferation of life. It carries out this role by allowing organic compounds to react in ways that ultimately allow replication. All known forms of life depend on water. Water is vital both as a solvent in which many of the body's solutes dissolve and as an essential part of many metabolic processes within the body. Metabolism is the sum total of anabolism and catabolism. In anabolism, water is removed from molecules (through energy requiring enzymatic chemical reactions) in order to grow larger molecules (e.g. starches, triglycerides and proteins for storage of fuels and information). In catabolism, water is used to break bonds in order to generate smaller molecules (e.g. glucose, fatty acids and amino acids to be used for fuels for energy use or other purposes). Without water, these particular metabolic processes could not exist.Water is fundamental to photosynthesis and respiration. Photosynthetic cells use the sun's energy to split off water's hydrogen from oxygen{{Citation needed|date=August 2018}}. Hydrogen is combined with CO2 (absorbed from air or water) to form glucose and release oxygen{{Citation needed|date=August 2018}}. All living cells use such fuels and oxidize the hydrogen and carbon to capture the sun's energy and reform water and CO2 in the process (cellular respiration).Water is also central to acid-base neutrality and enzyme function. An acid, a hydrogen ion (H+, that is, a proton) donor, can be neutralized by a base, a proton acceptor such as a hydroxide ion (OH−) to form water. Water is considered to be neutral, with a pH (the negative log of the hydrogen ion concentration) of 7. Acids have pH values less than 7 while bases have values greater than 7.

Aquatic life forms

{{Further information|Hydrobiology|Marine life|Aquatic plant}}File:Blue Linckia Starfish.JPG|thumb|upright|Some of the biodiversity of a coral reefcoral reefFile:Diatoms through the microscope.jpg|thumb|Some marine diatoms – a key phytoplanktonphytoplanktonEarth surface waters are filled with life. The earliest life forms appeared in water; nearly all fish live exclusively in water, and there are many types of marine mammals, such as dolphins and whales. Some kinds of animals, such as amphibians, spend portions of their lives in water and portions on land. Plants such as kelp and algae grow in the water and are the basis for some underwater ecosystems. Plankton is generally the foundation of the ocean food chain.Aquatic vertebrates must obtain oxygen to survive, and they do so in various ways. Fish have gills instead of lungs, although some species of fish, such as the lungfish, have both. Marine mammals, such as dolphins, whales, otters, and seals need to surface periodically to breathe air. Some amphibians are able to absorb oxygen through their skin. Invertebrates exhibit a wide range of modifications to survive in poorly oxygenated waters including breathing tubes (see insect and mollusc siphons) and gills (Carcinus). However as invertebrate life evolved in an aquatic habitat most have little or no specialisation for respiration in water.

Effects on human civilization

{{Refimprove section|date=May 2018}}File:Longwood Gardens-Italian Garden.jpg|thumb|right|Water fountainfountainCivilization has historically flourished around rivers and major waterways; Mesopotamia, the so-called cradle of civilization, was situated between the major rivers Tigris and Euphrates; the ancient society of the Egyptians depended entirely upon the Nile. Rome was also founded on the banks of the Italian river Tiber. Large metropolises like Rotterdam, London, Montreal, Paris, New York City, Buenos Aires, Shanghai, Tokyo, Chicago, and Hong Kong owe their success in part to their easy accessibility via water and the resultant expansion of trade. Islands with safe water ports, like Singapore, have flourished for the same reason. In places such as North Africa and the Middle East, where water is more scarce, access to clean drinking water was and is a major factor in human development.

Health and pollution

File:Field Trip- water sampling.jpg|thumb|An environmental science program – a student from Iowa State UniversityIowa State UniversityWater fit for human consumption is called drinking water or potable water. Water that is not potable may be made potable by filtration or distillation, or by a range of other methods.Water that is not fit for drinking but is not harmful for humans when used for swimming or bathing is called by various names other than potable or drinking water, and is sometimes called safe water, or "safe for bathing". Chlorine is a skin and mucous membrane irritant that is used to make water safe for bathing or drinking. Its use is highly technical and is usually monitored by government regulations (typically 1 part per million (ppm) for drinking water, and 1–2 ppm of chlorine not yet reacted with impurities for bathing water). Water for bathing may be maintained in satisfactory microbiological condition using chemical disinfectants such as chlorine or ozone or by the use of ultraviolet light.In the US, non-potable forms of wastewater generated by humans may be referred to as greywater, which is treatable and thus easily able to be made potable again, and blackwater, which generally contains sewage and other forms of waste which require further treatment in order to be made reusable. Greywater composes 50–80% of residential wastewater generated by a household's sanitation equipment (sinks, showers and kitchen runoff, but not toilets, which generate blackwater.) These terms may have different meanings in other countries and cultures.This natural resource is becoming scarcer in certain places, and its availability is a major social and economic concern. Currently, about a billion people around the world routinely drink unhealthy water. Most countries accepted the goal of halving by 2015 the number of people worldwide who do not have access to safe water and sanitation during the 2003 G8 Evian summit.WEB,weblinkweblink" title="web.archive.org/web/20030608042310weblink">weblink yes, 8 June 2003, G8 "Action plan" decided upon at the 2003 Evian summit, G8.fr, 2 June 2003, 25 July 2010, Even if this difficult goal is met, it will still leave more than an estimated half a billion people without access to safe drinking water and over a billion without access to adequate sanitation. Poor water quality and bad sanitation are deadly; some five million deaths a year are caused by polluted drinking water. The World Health Organization estimates that safe water could prevent 1.4 million child deaths from diarrhea each year.WEB,weblink World Health Organization. Safe Water and Global Health, Who.int, 25 June 2008, 25 July 2010, Water, however, is not a finite resource (meaning the availability of water is limited), but rather re-circulated as potable water in precipitationBOOK,weblink The Water Footprint of Modern Consumer Society, Hoekstra, Arjen Y., 19 June 2013, Routledge, 1136457046, in quantities many orders of magnitude higher than human consumption. Therefore, it is the relatively small quantity of water in reserve in the earth (about 1% of our drinking water supply,{{Citation needed|date=January 2017}} which is replenished in aquifers around every 1 to 10 years),{{Citation needed|date=January 2017}} that is a non-renewable resource, and it is, rather, the distribution of potable and irrigation water which is scarce,{{clarify |date=January 2017 |reason= distribution can not be scarce, can be lacking, or inefficient, or unjust, or unfair}} rather than the actual amount of it that exists on the earth. Water-poor countries use importation of goods as the primary method of importing water (to leave enough for local human consumption),{{Elucidate|date=January 2017 |reason=water importation, via products? unclear for regular reader}} since the manufacturing process{{clarify |date=January 2017 |reason= which manufacturing process?}} uses around 10 to 100 times products' masses in water.{{clarify |date=January 2017 |reason= this whole paragraph needs amendment}}In the developing world, 90% of all wastewater still goes untreated into local rivers and streams.BOOK, Environmentally Sound Technology for Wastewater and Stormwater Management: An International Source Book, UNEP International Environment, 2002, IWA Publishing, 1-84339-008-6, 49204666, Some 50 countries, with roughly a third of the world's population, also suffer from medium or high water stress, and 17 of these extract more water annually than is recharged through their natural water cycles.BOOK, Climate Change and Developing Countries, Ravindranath, Nijavalli H., Jayant A. Sathaye, 2002, Springer, 1-4020-0104-5, 231965991, The strain not only affects surface freshwater bodies like rivers and lakes, but it also degrades groundwater resources.

Human uses

{{Further information|Water supply}}

Agriculture

File:Subsurface drip emission on loamy soil.ogv|thumb|Water distribution in subsurface drip irrigationdrip irrigationFile:SiphonTubes.JPG|thumb|right|IrrigationIrrigationThe most important use of water in agriculture is for irrigation, which is a key component to produce enough food. Irrigation takes up to 90% of water withdrawn in some developing countriesWEB,weblinkweblink" title="web.archive.org/web/20120301011840weblink">weblink yes, 1 March 2012, WBCSD Water Facts & Trends, 25 July 2010, and significant proportions in more economically developed countries (in the United States, 30% of freshwater usage is for irrigation).Water Use in the United States, National Atlas.gov {{webarchive|url=https://web.archive.org/web/20090814045418weblink |date=14 August 2009 }}Fifty years ago, the common perception was that water was an infinite resource. At the time, there were fewer than half the current number of people on the planet. People were not as wealthy as today, consumed fewer calories and ate less meat, so less water was needed to produce their food. They required a third of the volume of water we presently take from rivers. Today, the competition for the fixed amount of water resources is much more intense, giving rise to the concept of peak water.JOURNAL, Gleick, P.H., Peak Water,weblink 11 October 2011, 2010, National Academy of Science, 10.1073/pnas.1004812107, Proceedings of the National Academy of Sciences, 107, 125, 11155–11162, Palaniappan, M., 2010PNAS..10711155G, 2895062, This is because there are now nearly seven billion people on the planet, their consumption of water-thirsty meat and vegetables is rising, and there is increasing competition for water from industry, urbanisation and biofuel crops. In future, even more water will be needed to produce food because the Earth's population is forecast to rise to 9 billion by 2050.United Nations Press Release POP/952 (13 March 2007). World population will increase by 2.5 billion by 2050An assessment of water management in agriculture was conducted in 2007 by the International Water Management Institute in Sri Lanka to see if the world had sufficient water to provide food for its growing population.Molden, D. (Ed). Water for food, Water for life: A Comprehensive Assessment of Water Management in Agriculture. Earthscan/IWMI, 2007. It assessed the current availability of water for agriculture on a global scale and mapped out locations suffering from water scarcity. It found that a fifth of the world's people, more than 1.2 billion, live in areas of physical water scarcity, where there is not enough water to meet all demands. A further 1.6 billion people live in areas experiencing economic water scarcity, where the lack of investment in water or insufficient human capacity make it impossible for authorities to satisfy the demand for water. The report found that it would be possible to produce the food required in future, but that continuation of today's food production and environmental trends would lead to crises in many parts of the world. To avoid a global water crisis, farmers will have to strive to increase productivity to meet growing demands for food, while industry and cities find ways to use water more efficiently.Chartres, C. and Varma, S. (2010) Out of water. From Abundance to Scarcity and How to Solve the World's Water Problems. FT Press (US).Water scarcity is also caused by production of cotton: 1 kg of cotton—equivalent of a pair of jeans—requires {{convert|10.9|m3|sp=us}} water to produce. While cotton accounts for 2.4% of world water use, the water is consumed in regions which are already at a risk of water shortage. Significant environmental damage has been caused, such as disappearance of the Aral Sea.waterfootprint.org/media/downloads/Report18.pdf

As a scientific standard

On 7 April 1795, the gram was defined in France to be equal to "the absolute weight of a volume of pure water equal to a cube of one hundredth of a meter, and at the temperature of melting ice".Décret relatif aux poids et aux mesures. 18 germinal an 3 (7 April 1795). Decree relating to the weights and measurements (in French). quartier-rural.org For practical purposes though, a metallic reference standard was required, one thousand times more massive, the kilogram. Work was therefore commissioned to determine precisely the mass of one liter of water. In spite of the fact that the decreed definition of the gram specified water at {{convert|0|C}}—a highly reproducible temperature—the scientists chose to redefine the standard and to perform their measurements at the temperature of highest water density, which was measured at the time as {{convert|4|C}}.here L'Histoire Du Mètre, La Détermination De L'Unité De Poids. histoire.du.metre.free.frThe Kelvin temperature scale of the SI system is based on the triple point of water, defined as exactly {{convert|273.16|K|C F}}. The scale is an absolute temperature scale with the same increment as the Celsius temperature scale, which was originally defined according to the boiling point (set to {{convert|100|C}}) and melting point (set to {{convert|0|C}}) of water.Natural water consists mainly of the isotopes hydrogen-1 and oxygen-16, but there is also a small quantity of heavier isotopes such as hydrogen-2 (deuterium). The amount of deuterium oxides or heavy water is very small, but it still affects the properties of water. Water from rivers and lakes tends to contain less deuterium than seawater. Therefore, standard water is defined in the Vienna Standard Mean Ocean Water specification.

For drinking

File:Humanitarian aid OCPA-2005-10-28-090517a.jpg|thumb|A young girl drinking bottled waterbottled water(File:2006 Global Water Availability.svg|thumb|right|Water availability: fraction of population using improved water sources by country)The human body contains from 55% to 78% water, depending on body size.Re: What percentage of the human body is composed of water? Jeffrey Utz, M.D., The MadSci Network To function properly, the body requires between {{convert|1|and|7|L|sp=us|spell=in}} of water per day to avoid dehydration; the precise amount depends on the level of activity, temperature, humidity, and other factors. Most of this is ingested through foods or beverages other than drinking straight water. It is not clear how much water intake is needed by healthy people, though most specialists agree that approximately 2 liters (6 to 7 glasses) of water daily is the minimum to maintain proper hydration.WEB,weblink Healthy Water Living, BBC, 1 February 2007, yes,weblink" title="web.archive.org/web/20070101100025weblink">weblink 1 January 2007, Medical literature favors a lower consumption, typically 1 liter of water for an average male, excluding extra requirements due to fluid loss from exercise or warm weather.BOOK, Rhoades RA, Tanner GA, Medical Physiology, Lippincott Williams & Wilkins, 2nd, Baltimore, 2003, 0-7817-1936-4, 50554808, For those who have healthy kidneys, it is rather difficult to drink too much water, but (especially in warm humid weather and while exercising) it is dangerous to drink too little. People can drink far more water than necessary while exercising, however, putting them at risk of water intoxication (hyperhydration), which can be fatal.JOURNAL, Noakes TD, Goodwin N, Rayner BL, etal, Water intoxication: a possible complication during endurance exercise, Med Sci Sports Exerc, 1985, 17, 3, 370–375, 4021781,weblink 10.1249/00005768-198506000-00012, JOURNAL, Noakes TD, Goodwin N, Rayner BL, Branken T, Taylor RK, Water intoxication: a possible complication during endurance exercise, 1985, Wilderness Environ Med, 2005, 16, 4, 221–227, 16366205, 10.1580/1080-6032(2005)16[221:WIAPCD]2.0.CO;2, The popular claim that "a person should consume eight glasses of water per day" seems to have no real basis in science.WEB,weblink "Drink at least eight glasses of water a day." Really? Is there scientific evidence for "8 × 8"?, 3 March 2016, yes,weblink" title="web.archive.org/web/20100420204226weblink">weblink 20 April 2010, dmy-all, Studies have shown that extra water intake, especially up to {{convert|500|ml|sp=us}} at mealtime was conducive to weight loss.JOURNAL, Stookey JD, Constant F, Popkin BM, Gardner CD, Drinking water is associated with weight loss in overweight dieting women independent of diet and activity, Obesity, 16, 11, 2481–2488, November 2008, 18787524, 10.1038/oby.2008.409, WEB,weblink Drink water to curb weight gain? Clinical trial confirms effectiveness of simple appetite control method, 23 August 2010, www.sciencedaily.com, 14 May 2017, JOURNAL, Dubnov-Raz G, Constantini NW, Yariv H, Nice S, Shapira N, Influence of water drinking on resting energy expenditure in overweight children, International Journal of Obesity, 35, 10, 1295–1300, October 2011, 21750519, 10.1038/ijo.2011.130, JOURNAL, Dennis EA, Dengo AL, Comber DL, etal, Water consumption increases weight loss during a hypocaloric diet intervention in middle-aged and older adults, Obesity, 18, 2, 300–307, February 2010, 19661958, 2859815, 10.1038/oby.2009.235, JOURNAL, Vij VA, Joshi AS, Effect of 'water induced thermogenesis' on body weight, body mass index and body composition of overweight subjects, Journal of Clinical and Diagnostic Research, 7, 9, 1894–1896, September 2013, 24179891, 3809630, 10.7860/JCDR/2013/5862.3344, JOURNAL, Muckelbauer R, Sarganas G, Grüneis A, Müller-Nordhorn J, Association between water consumption and body weight outcomes: a systematic review, The American Journal of Clinical Nutrition, 98, 2, 282–299, August 2013, 23803882, 10.3945/ajcn.112.055061, Adequate fluid intake is helpful in preventing constipation.Water, Constipation, Dehydration, and Other Fluids. Sciencedaily.com. Retrieved on 28 September 2015.File:DIN 4844-2 D-P005.svg|thumb|right|Hazard symbolHazard symbolAn original recommendation for water intake in 1945 by the Food and Nutrition Board of the United States National Research Council read: "An ordinary standard for diverse persons is 1 milliliter for each calorie of food. Most of this quantity is contained in prepared foods."BOOK, Food and Nutrition Board, National Academy of Sciences. Recommended Dietary Allowances., National Research Council, Reprint and Circular Series, No. 122, 1945, 3–18, The latest dietary reference intake report by the United States National Research Council in general recommended, based on the median total water intake from US survey data (including food sources): {{convert|3.7|L|sp=us}} for men and {{convert|2.7|L|sp=us}} of water total for women, noting that water contained in food provided approximately 19% of total water intake in the survey.BOOK,weblink 4 Water {{!, Dietary Reference Intakes for Water, Potassium, Sodium, Chloride, and Sulfate {{!}} The National Academies Press|doi=10.17226/10925}}Specifically, pregnant and breastfeeding women need additional fluids to stay hydrated. The Institute of Medicine (US) recommends that, on average, men consume {{convert|3|L|sp=us}} and women {{convert|2.2|L|sp=us}}; pregnant women should increase intake to {{convert|2.4|L|sp=us}} and breastfeeding women should get 3 liters (12 cups), since an especially large amount of fluid is lost during nursing.WEB,weblink Water: How much should you drink every day?, Mayoclinic.com, 25 July 2010, Also noted is that normally, about 20% of water intake comes from food, while the rest comes from drinking water and beverages (caffeinated included). Water is excreted from the body in multiple forms; through urine and feces, through sweating, and by exhalation of water vapor in the breath. With physical exertion and heat exposure, water loss will increase and daily fluid needs may increase as well.Humans require water with few impurities. Common impurities include metal salts and oxides, including copper, iron, calcium and lead,Conquering Chemistry 4th Ed. Published 2008 and/or harmful bacteria, such as Vibrio. Some solutes are acceptable and even desirable for taste enhancement and to provide needed electrolytes.BOOK, Maton, Anthea, Jean Hopkins, Charles William McLaughlin, Susan Johnson, Maryanna Quon Warner, David LaHart, Jill D. Wright, Human Biology and Health, Prentice Hall, 1993, Englewood Cliffs, New Jersey, 0-13-981176-1, 32308337, The single largest (by volume) freshwater resource suitable for drinking is Lake Baikal in Siberia.BOOK,weblink 125, Water: a shared responsibility, Unesco, Berghahn Books, 2006, 1-84545-177-5,

Washing

The propensity of water to form solutions and emulsions is useful in various washing processes. Washing is also an important component of several aspects of personal body hygiene. Most of personal water use is due to showering, doing the laundry and dishwashing, reaching hundreds of liters per day in developed countries.

Transportation

The use of water for transportation of materials through rivers and canals as well as the international shipping lanes is an important part of the world economy.

Chemical uses

Water is widely used in chemical reactions as a solvent or reactant and less commonly as a solute or catalyst. In inorganic reactions, water is a common solvent, dissolving many ionic compounds, as well as other polar compounds such as ammonia and compounds closely related to water. In organic reactions, it is not usually used as a reaction solvent, because it does not dissolve the reactants well and is amphoteric (acidic and basic) and nucleophilic. Nevertheless, these properties are sometimes desirable. Also, acceleration of Diels-Alder reactions by water has been observed. Supercritical water has recently been a topic of research. Oxygen-saturated supercritical water combusts organic pollutants efficiently. Water vapor is used for some processes in the chemical industry. An example is the production of acrylic acid from acrolein, propylene and propaneJOURNAL, The reaction network in propane oxidation over phase-pure MoVTeNb M1 oxide catalysts, Journal of Catalysis, 2014, 311, 369–385,weblink 10.1016/j.jcat.2013.12.008, JOURNAL, Surface chemistry of phase-pure M1 MoVTeNb oxide during operation in selective oxidation of propane to acrylic acid, Journal of Catalysis, 2012, 285, 48–60,weblink 10.1016/j.jcat.2011.09.012, BOOK, Kinetic studies of propane oxidation on Mo and V based mixed oxide catalysts, 2011,weblink JOURNAL, Multifunctionality of Crystalline MoV(TeNb) M1 Oxide Catalysts in Selective Oxidation of Propane and Benzyl Alcohol, ACS Catalysis, 2013, 3, 6, 1103–1113,weblink 10.1021/cs400010q, . The possible effect of water in these reactions includes the physical-, chemical interaction of water with the catalyst and the chemical reaction of water with the reaction intermediates.

Heat exchange

Water and steam are a common fluid used for heat exchange, due to its availability and high heat capacity, both for cooling and heating. Cool water may even be naturally available from a lake or the sea. It's especially effective to transport heat through vaporization and condensation of water because of its large latent heat of vaporization. A disadvantage is that metals commonly found in industries such as steel and copper are oxidized faster by untreated water and steam. In almost all thermal power stations, water is used as the working fluid (used in a closed loop between boiler, steam turbine and condenser), and the coolant (used to exchange the waste heat to a water body or carry it away by evaporation in a cooling tower). In the United States, cooling power plants is the largest use of water.In the nuclear power industry, water can also be used as a neutron moderator. In most nuclear reactors, water is both a coolant and a moderator. This provides something of a passive safety measure, as removing the water from the reactor also slows the nuclear reaction down. However other methods are favored for stopping a reaction and it is preferred to keep the nuclear core covered with water so as to ensure adequate cooling.

Fire extinction

File:MH-60S Helicopter dumps water onto Fire.jpg|right|thumb|Water is used for fighting wildfirewildfireWater has a high heat of vaporization and is relatively inert, which makes it a good fire extinguishing fluid. The evaporation of water carries heat away from the fire. It is dangerous to use water on fires involving oils and organic solvents, because many organic materials float on water and the water tends to spread the burning liquid.Use of water in fire fighting should also take into account the hazards of a steam explosion, which may occur when water is used on very hot fires in confined spaces, and of a hydrogen explosion, when substances which react with water, such as certain metals or hot carbon such as coal, charcoal, or coke graphite, decompose the water, producing water gas.The power of such explosions was seen in the Chernobyl disaster, although the water involved did not come from fire-fighting at that time but the reactor's own water cooling system. A steam explosion occurred when the extreme overheating of the core caused water to flash into steam. A hydrogen explosion may have occurred as a result of reaction between steam and hot zirconium.

Recreation

File:Grand Anse Beach Grenada.jpg|thumb|right|Grand Anse Beach, St. George's, Grenada, West IndiesWest IndiesHumans use water for many recreational purposes, as well as for exercising and for sports. Some of these include swimming, waterskiing, boating, surfing and diving. In addition, some sports, like ice hockey and ice skating, are played on ice. Lakesides, beaches and water parks are popular places for people to go to relax and enjoy recreation. Many find the sound and appearance of flowing water to be calming, and fountains and other water features are popular decorations. Some keep fish and other life in aquariums or ponds for show, fun, and companionship. Humans also use water for snow sports i.e. skiing, sledding, snowmobiling or snowboarding, which require the water to be frozen.

Water industry

(File:Water carrier in India.jpg|thumb|upright|A water-carrier in India, 1882. In many places where running water is not available, water has to be transported by people.)File:TapWater-china.JPG|thumb|A manual water pumppumpFile:Usine Bret MG 1648.jpg|thumb|Water purificationWater purificationFile:Reverse osmosis desalination plant.JPG|thumb|Reverse osmosis (RO) desalination plant in BarcelonaBarcelonaThe water industry provides drinking water and wastewater services (including sewage treatment) to households and industry. Water supply facilities include water wells, cisterns for rainwater harvesting, water supply networks, and water purification facilities, water tanks, water towers, water pipes including old aqueducts. Atmospheric water generators are in development.Drinking water is often collected at springs, extracted from artificial borings (wells) in the ground, or pumped from lakes and rivers. Building more wells in adequate places is thus a possible way to produce more water, assuming the aquifers can supply an adequate flow. Other water sources include rainwater collection. Water may require purification for human consumption. This may involve removal of undissolved substances, dissolved substances and harmful microbes. Popular methods are filtering with sand which only removes undissolved material, while chlorination and boiling kill harmful microbes. Distillation does all three functions. More advanced techniques exist, such as reverse osmosis. Desalination of abundant seawater is a more expensive solution used in coastal arid climates.The distribution of drinking water is done through municipal water systems, tanker delivery or as bottled water. Governments in many countries have programs to distribute water to the needy at no charge.Reducing usage by using drinking (potable) water only for human consumption is another option. In some cities such as Hong Kong, sea water is extensively used for flushing toilets citywide in order to conserve fresh water resources.Polluting water may be the biggest single misuse of water; to the extent that a pollutant limits other uses of the water, it becomes a waste of the resource, regardless of benefits to the polluter. Like other types of pollution, this does not enter standard accounting of market costs, being conceived as externalities for which the market cannot account. Thus other people pay the price of water pollution, while the private firms' profits are not redistributed to the local population, victims of this pollution. Pharmaceuticals consumed by humans often end up in the waterways and can have detrimental effects on aquatic life if they bioaccumulate and if they are not biodegradable.Municipal and industrial wastewater are typically treated at wastewater treatment plants. Mitigation of polluted surface runoff is addressed through a variety of prevention and treatment techniques. (See Surface runoff#Mitigation and treatment.)

Industrial applications

Many industrial processes rely on reactions using chemicals dissolved in water, suspension of solids in water slurries or using water to dissolve and extract substances, or to wash products or process equipment. Processes such as mining, chemical pulping, pulp bleaching, paper manufacturing, textile production, dyeing, printing, and cooling of power plants use large amounts of water, requiring a dedicated water source, and often cause significant water pollution.Water is used in power generation. Hydroelectricity is electricity obtained from hydropower. Hydroelectric power comes from water driving a water turbine connected to a generator. Hydroelectricity is a low-cost, non-polluting, renewable energy source. The energy is supplied by the motion of water. Typically a dam is constructed on a river, creating an artificial lake behind it. Water flowing out of the lake is forced through turbines that turn generators.{{wide image|200407-sandouping-sanxiadaba-4.med.jpg|800px|Three Gorges Dam is the largest hydro-electric power station.}}Pressurized water is used in water blasting and water jet cutters. Also, very high pressure water guns are used for precise cutting. It works very well, is relatively safe, and is not harmful to the environment. It is also used in the cooling of machinery to prevent overheating, or prevent saw blades from overheating.Water is also used in many industrial processes and machines, such as the steam turbine and heat exchanger, in addition to its use as a chemical solvent. Discharge of untreated water from industrial uses is pollution. Pollution includes discharged solutes (chemical pollution) and discharged coolant water (thermal pollution). Industry requires pure water for many applications and utilizes a variety of purification techniques both in water supply and discharge.

Food processing

File:Cuisson des pates.jpg|thumb|Water can be used to cook foods such as noodlesnoodlesBoiling, steaming, and simmering are popular cooking methods that often require immersing food in water or its gaseous state, steam.BOOK,weblink A Course in Household Arts: Part I, Duff, Sister Loretto Basil, 1916, Whitcomb & Barrows, Water is also used for dishwashing. Water also plays many critical roles within the field of food science. It is important for a food scientist to understand the roles that water plays within food processing to ensure the success of their products.{{citation needed|date=January 2014}}Solutes such as salts and sugars found in water affect the physical properties of water. The boiling and freezing points of water are affected by solutes, as well as air pressure, which is in turn affected by altitude. Water boils at lower temperatures with the lower air pressure that occurs at higher elevations. One mole of sucrose (sugar) per kilogram of water raises the boiling point of water by {{convert|0.51|C-change|3}}, and one mole of salt per kg raises the boiling point by {{convert|1.02|C-change|3}}; similarly, increasing the number of dissolved particles lowers water's freezing point.BOOK, Essentials of Food Science,weblink 2007, Vaclavik, Vickie A., Christian, Elizabeth W, yes, Springer, 0-387-69939-2, Solutes in water also affect water activity that affects many chemical reactions and the growth of microbes in food.BOOK,weblink Principles of Food Chemistry, 1999, DeMan, John M, Springer, 0-8342-1234-X, Water activity can be described as a ratio of the vapor pressure of water in a solution to the vapor pressure of pure water. Solutes in water lower water activity—this is important to know because most bacterial growth ceases at low levels of water activity. Not only does microbial growth affect the safety of food, but also the preservation and shelf life of food.Water hardness is also a critical factor in food processing and may be altered or treated by using a chemical ion exchange system. It can dramatically affect the quality of a product, as well as playing a role in sanitation. Water hardness is classified based on concentration of calcium carbonate the water contains. Water is classified as soft if it contains less than 100 mg/l (UK)WEB,weblink Map showing the rate of hardness in mg/l as Calcium carbonate in England and Wales, DEFRA/ Drinking Water Inspectorate, 2009, or less than 60 mg/l (US).WEB,weblink US Geological Service, Water hardness, 8 April 2014, According to a report published by the Water Footprint organization in 2010, a single kilogram of beef requires {{convert|15|e3L|e3impgal+e3usgal|sp=us}} of water; however, the authors also make clear that this is a global average and circumstantial factors determine the amount of water used in beef production.WEB, The green, blue and grey water footprint of farm animals and animal products, Value of Water Research Report Series No. 48 – Volume 1: Main report,weblink The green, blue and grey water footprint of farm animals and animal products, Value of Water Research Report Series No. 48 – Volume 1: Main report, UNESCO – IHE Institute for Water Education, 30 January 2014, M.M. Mekonnen, A.Y. Hoekstra, December 2010,

Medical use

(File:Sterilewater.jpg|thumb|Sterile water for injection)Water for injection is on the World Health Organization's list of essential medicines.WEB,weblink WHO Model List of EssentialMedicines, October 2013, World Health Organization, 22 April 2014,

Distribution in nature

In the universe

File:Band 5 ALMA receiver.jpg|thumb|Band 5 ALMA receiver is an instrument specifically designed to detect water in the universe.WEB, ALMA Greatly Improves Capacity to Search for Water in Universe,weblink 20 July 2015, ]]Much of the universe's water is produced as a byproduct of star formation. The formation of stars is accompanied by a strong outward wind of gas and dust. When this outflow of material eventually impacts the surrounding gas, the shock waves that are created compress and heat the gas. The water observed is quickly produced in this warm dense gas.Melnick, Gary, Harvard-Smithsonian Center for Astrophysics and Neufeld, David, Johns Hopkins University quoted in:NEWS,weblink Discover of Water Vapor Near Orion Nebula Suggests Possible Origin of H20 in Solar System (sic), 23 April 1998, The Harvard University Gazette, yes,weblink" title="web.archive.org/web/20000116054013weblink">weblink 16 January 2000, NEWS,weblink Space Cloud Holds Enough Water to Fill Earth's Oceans 1 Million Times, 9 April 1998, Headlines@Hopkins, JHU, NEWS,weblink Water, Water Everywhere: Radio telescope finds water is common in universe, 25 February 1999, The Harvard University Gazette, (weblink" title="web.archive.org/web/20160715053715weblink">archive link)On 22 July 2011, a report described the discovery of a gigantic cloud of water vapor containing "140 trillion times more water than all of Earth's oceans combined" around a quasar located 12 billion light years from Earth. According to the researchers, the "discovery shows that water has been prevalent in the universe for nearly its entire existence".WEB, Clavin, Whitney, Buis, Alan, Astronomers Find Largest, Most Distant Reservoir of Water,weblink 22 July 2011, NASA, 25 July 2011, WEB, Staff, Astronomers Find Largest, Oldest Mass of Water in Universe,weblink 22 July 2011, Space.com, 23 July 2011, Water has been detected in interstellar clouds within our galaxy, the Milky Way.BOOK,weblink Faint Echoes, Distant Stars: The Science and Politics of Finding Life Beyond Earth, Bova, Ben, 13 October 2009, Zondervan, 9780061854484, Water probably exists in abundance in other galaxies, too, because its components, hydrogen and oxygen, are among the most abundant elements in the universe. Based on models of the formation and evolution of the Solar System and that of other star systems, most other planetary systems are likely to have similar ingredients.

Water vapor

Water is present as vapor in:
  • Atmosphere of the Sun: in detectable trace amountsJOURNAL, Solanki, S. K., Livingston, W., Ayres, T., 1994, New Light on the Heart of Darkness of the Solar Chromosphere, Science (journal), Science, 17748350, 263, 5143, 64–66, 1994Sci...263...64S, 10.1126/science.263.5143.64, harv,
  • Atmosphere of Mercury: 3.4%, and large amounts of water in Mercury's exosphereWEB,weblink MESSENGER Scientists 'Astonished' to Find Water in Mercury's Thin Atmosphere, 5 July 2008, Planetary Society, 3 July 2008,weblink 17 January 2010,
  • Atmosphere of Venus: 0.002%JOURNAL, Bertaux, Jean-Loup, A warm layer in Venus' cryosphere and high-altitude measurements of HF, HCl, H2O and HDO, Nature, 2007, 450, 646–649, 10.1038/nature05974, 2007Natur.450..646B, 18046397, 7170, Vandaele, Ann-Carine, Korablev, Oleg, Villard, E., Fedorova, A., Fussen, D., Quémerais, E., Belyaev, D., Mahieux, A., 8,
  • Earth's atmosphere: ≈0.40% over full atmosphere, typically 1–4% at surface; as well as that of the Moon in trace amountsJOURNAL, Sridharan, R., S.M., Ahmed, Tirtha Pratim, Dasa, P., Sreelathaa, P., Pradeepkumara, Neha, Naika, Gogulapati, Supriya, 2010, 947, 6, 58, 'Direct' evidence for water (H2O) in the sunlit lunar ambience from CHACE on MIP of Chandrayaan I, Planetary and Space Science, 10.1016/j.pss.2010.02.013, 2010P&SS...58..947S,
  • Atmosphere of Mars: 0.03%BOOK, Rapp, Donald, Use of Extraterrestrial Resources for Human Space Missions to Moon or Mars,weblink 28 November 2012, Springer, 978-3-642-32762-9, 78,
  • Atmosphere of CeresJOURNAL, Küppers, M., O'Rourke, L., Bockelée-Morvan, D., Zakharov, V., Lee, S., Von Allmen, P., Carry, B., Teyssier, D., Marston, A., Müller, T., Crovisier, J., Barucci, M. A., Moreno, R., Localized sources of water vapour on the dwarf planet (1) Ceres, Nature, 505, 7484, 23 January 2014, 525–527, 10.1038/nature12918, 24451541, 2014Natur.505..525K,
  • Atmosphere of Jupiter: 0.0004%JOURNAL, 10.1007/s11214-005-1951-5, Atreya, Sushil K., Wong, Ah-San, 2005, Coupled Clouds and Chemistry of the Giant Planets â€” A Case for Multiprobes, Space Science Reviews, 116, 121–136,weblink PDF, 2005SSRv..116..121A, harv, – in ices only; and that of its moon EuropaWEB, Cook, Jia-Rui C., Gutro, Rob, Brown, Dwayne, Harrington, J.D., Fohn, Joe, Hubble Sees Evidence of Water Vapor at Jupiter Moon,weblink 12 December 2013, NASA, 12 December 2013,
  • Atmosphere of Saturn – in ices only; and that of its moons Titan (stratospheric),{{Citation needed|date=May 2018}} Enceladus: 91%JOURNAL, 10.1126/science.1121254, Enceladus' Water Vapor Plume, 2006, Hansen, Science, 311, 1422–1425, 16527971, 5766, 2006Sci...311.1422H, C. J., 2, Stewart, AI, Colwell, J, Hendrix, A, Pryor, W, Shemansky, D, West, R, and Dione (exosphere){{Citation needed|date=May 2018}}
  • Atmosphere of Uranus – in trace amounts below 50 bar
  • Atmosphere of Neptune – found in the deeper layersJOURNAL, Hubbard, W. B., Neptune's Deep Chemistry, Science, 1997, 275, 5304, 1279–1280, 10.1126/science.275.5304.1279, 9064785,
  • Extrasolar planet atmospheres: including those of HD 189733 bWater Found on Distant Planet 12 July 2007 By Laura Blue, Time and HD 209458 b,Water Found in Extrasolar Planet's Atmosphere – Space.com Tau Boötis b,Near-IR Direct Detection of Water Vapor in Tau Boo b: Alexandra C. Lockwood, John A. Johnson, Chad F. Bender, John S. Carr, Travis Barman, Alexander J.W. Richert, Geoffrey A. Blake HAT-P-11b,WEB, Clavin, Whitney, Chou, Felicia, Weaver, Donna, Villard, Ray, Johnson, Michele, NASA Telescopes Find Clear Skies and Water Vapor on Exoplanet,weblink 24 September 2014, NASA, 24 September 2014, BOOK, Arnold Hanslmeier, Water in the Universe,weblink 29 September 2010, Springer Science & Business Media, 978-90-481-9984-6, 159–, XO-1b, WASP-12b, WASP-17b, and WASP-19b.WEB, Hubble Traces Subtle Signals of Water on Hazy Worlds,weblink 3 December 2013, NASA, 4 December 2013,
  • Stellar atmospheres: not limited to cooler stars and even detected in giant hot stars such as Betelgeuse, Mu Cephei, Antares and Arcturus.Andersson, Jonas (June 2012). Water in stellar atmospheres "Is a novel picture required to explain the atmospheric behavior of water in red giant stars?" Lund Observatory, Lund University, Sweden
  • Circumstellar disks: including those of more than half of T Tauri stars such as AA Tauri as well as TW Hydrae,Herschel Finds Oceans of Water in Disk of Nearby Star. Nasa.gov (20 October 2011). Retrieved on 28 September 2015.Herschel Finds Oceans of Water in Disk of Nearby Star {{webarchive |url=https://web.archive.org/web/20120604082809weblink |date=4 June 2012 }} IRC +10216Lloyd, Robin. "Water Vapor, Possible Comets, Found Orbiting Star", 11 July 2001, Space.com. Retrieved 15 December 2006. {{webarchive |url=https://web.archive.org/web/20090523025818weblink |date=23 May 2009 }} and APM 08279+5255, VY Canis Majoris and S Persei.

Liquid water

Liquid water is present on Earth, covering 71% of its surface.{{Citation needed|date=May 2018}} Liquid water is also occasionally present in small amounts on Mars.{{Citation needed|date=May 2018}} Scientists believe liquid water is present in the Saturnian moons of Enceladus, as a 10-kilometre thick ocean approximately 30–40 kilometres below Enceladus' south polar surface,WEB, Platt, Jane, Bell, Brian, NASA Space Assets Detect Ocean inside Saturn Moon,weblink 3 April 2014, NASA, 3 April 2014, JOURNAL, Iess, L., Stevenson, D.J., Parisi, M., Hemingway, D., Jacobson, R.A., Lunine, J.I., Nimmo, F., Armstrong, J.w., Asmar, S.w., Ducci, M., Tortora, P., The Gravity Field and Interior Structure of Enceladus,weblink 4 April 2014, Science (journal), Science, 344, 6179, 78–80, 10.1126/science.1250551, 3 April 2014, 2014Sci...344...78I, 24700854, and Titan, as a subsurface layer, possibly mixed with ammonia.BOOK,weblink 2013LPI....44.2454D, Numerical Models of Titan's Interior with Subsurface Ocean, Dunaeva, A. N., Kronrod, V. A., Kuskov, O. L., 44th Lunar and Planetary Science Conference, held March 18–22, 2013 in The Woodlands, Texas. LPI Contribution No. 1719, 2454, Jupiter's moon Europa has surface characteristics which suggest a subsurface liquid water ocean.WEB,weblink Possibility of Life on Europa, Tritt, Charles S., 10 August 2007, Milwaukee School of Engineering, 2002, yes,weblink" title="web.archive.org/web/20070609150109weblink">weblink 9 June 2007, Liquid water may also exist on Jupiter's moon Ganymede as a layer sandwiched between high pressure ice and rock.Dunham, Will. (3 May 2014) Jupiter's moon Ganymede may have 'club sandwich' layers of ocean | Reuters. In.reuters.com. Retrieved on 28 September 2015.

Water ice

Water is present as ice on:(File:South Polar Cap of Mars during Martian South summer 2000.jpg|thumb|left|South Polar ice cap of Mars during Martian South summer 2000) And may also be present on:

Exotic forms

Water and other volatiles probably comprise much of the internal structures of Uranus and Neptune and the water in the deeper layers may be in the form of ionic water in which the molecules break down into a soup of hydrogen and oxygen ions, and deeper still as superionic water in which the oxygen crystallises but the hydrogen ions float about freely within the oxygen lattice.Weird water lurking inside giant planets, New Scientist, 1 September 2010, Magazine issue 2776.

Water and habitable zone

{{Further information|Water distribution on Earth}}The existence of liquid water, and to a lesser extent its gaseous and solid forms, on Earth are vital to the existence of life on Earth as we know it. The Earth is located in the habitable zone of the solar system; if it were slightly closer to or farther from the Sun (about 5%, or about 8 million kilometers), the conditions which allow the three forms to be present simultaneously would be far less likely to exist.BOOK, J. C. I. Dooge. "Integrated Management of Water Resources", Ehlers, E., Krafft, T, Understanding the Earth System: compartments, processes, and interactions, Springer, 2001, 116, WEB, Habitable Zone,weblink The Encyclopedia of Astrobiology, Astronomy and Spaceflight, Earth's gravity allows it to hold an atmosphere. Water vapor and carbon dioxide in the atmosphere provide a temperature buffer (greenhouse effect) which helps maintain a relatively steady surface temperature. If Earth were smaller, a thinner atmosphere would allow temperature extremes, thus preventing the accumulation of water except in polar ice caps (as on Mars).{{Citation needed|date=May 2018}}The surface temperature of Earth has been relatively constant through geologic time despite varying levels of incoming solar radiation (insolation), indicating that a dynamic process governs Earth's temperature via a combination of greenhouse gases and surface or atmospheric albedo. This proposal is known as the Gaia hypothesis.{{Citation needed|date=May 2018}}The state of water on a planet depends on ambient pressure, which is determined by the planet's gravity. If a planet is sufficiently massive, the water on it may be solid even at high temperatures, because of the high pressure caused by gravity, as it was observed on exoplanets Gliese 436 bNEWS, New Scientist,weblink Strange alien world made of "hot ice", 6 May 2007, David, Shiga, 28 March 2010, yes,weblink" title="web.archive.org/web/20080706143705weblink">weblink 6 July 2008, and GJ 1214 b.WEB,weblink Astronomers Find Super-Earth Using Amateur, Off-the-Shelf Technology, Aguilar, David A., 16 December 2009, Harvard-Smithsonian Center for Astrophysics, 28 March 2010,

Law, politics, and crisis

File:Access to drinking water in third world.svg|thumb|upright=1.35|An estimate of the share of people in developing countries with access to potable waterpotable waterWater politics is politics affected by water and water resources. For this reason, water is a strategic resource in the globe and an important element in many political conflicts. It causes health impacts and damage to biodiversity.Access to safe drinking water has improved over the last decades in almost every part of the world, but approximately one billion people still lack access to safe water and over 2.5 billion lack access to adequate sanitation. However, some observers have estimated that by 2025 more than half of the world population will be facing water-based vulnerability.JOURNAL, Kulshreshtha, S.N, 1998, A Global Outlook for Water Resources to the Year 2025, Water Resources Management, 12, 3, 167–184, 10.1023/A:1007957229865, A report, issued in November 2009, suggests that by 2030, in some developing regions of the world, water demand will exceed supply by 50%.WEB,weblink Charting Our Water Future: Economic frameworks to inform decision-making, PDF, 25 July 2010, yes,weblink" title="web.archive.org/web/20100705072816weblink">weblink 5 July 2010, 1.6 billion people have gained access to a safe water source since 1990.The Millennium Development Goals Report, United Nations, 2008 The proportion of people in developing countries with access to safe water is calculated to have improved from 30% in 1970BOOK, Lomborg, Björn, 2001, The Skeptical Environmentalist, Cambridge University Press, 0-521-01068-3,weblink 22, yes,weblink" title="web.archive.org/web/20130725173040weblink">weblink 25 July 2013, to 71% in 1990, 79% in 2000 and 84% in 2004. This trend is projected to continue.WEB,weblink MDG Report 2008, 25 July 2010, To halve, by 2015, the proportion of people without sustainable access to safe drinking water is one of the Millennium Development Goals. This goal is projected to be reached.{{Citation needed|date=May 2018}}A 2006 United Nations report stated that "there is enough water for everyone", but that access to it is hampered by mismanagement and corruption.UNESCO, (2006), Water, a shared responsibility. The United Nations World Water Development Report 2. In addition, global initiatives to improve the efficiency of aid delivery, such as the Paris Declaration on Aid Effectiveness, have not been taken up by water sector donors as effectively as they have in education and health, potentially leaving multiple donors working on overlapping projects and recipient governments without empowerment to act.Welle, Katharina; Evans, Barbara; Tucker, Josephine and Nicol, Alan (2008) Is water lagging behind on Aid Effectiveness?The authors of the 2007 Comprehensive Assessment of Water Management in Agriculture cited poor governance as one reason for some forms of water scarcity. Water governance is the set of formal and informal processes through which decisions related to water management are made. Good water governance is primarily about knowing what processes work best in a particular physical and socioeconomic context. Mistakes have sometimes been made by trying to apply 'blueprints' that work in the developed world to developing world locations and contexts. The Mekong river is one example; a review by the International Water Management Institute of policies in six countries that rely on the Mekong river for water found that thorough and transparent cost-benefit analyses and environmental impact assessments were rarely undertaken. They also discovered that Cambodia's draft water law was much more complex than it needed to be.WEB,weblink Search Results, International Water Management Institute (IWMI), 3 March 2016, The UN World Water Development Report (WWDR, 2003) from the World Water Assessment Program indicates that, in the next 20 years, the quantity of water available to everyone is predicted to decrease by 30%. 40% of the world's inhabitants currently have insufficient fresh water for minimal hygiene. More than 2.2 million people died in 2000 from waterborne diseases (related to the consumption of contaminated water) or drought. In 2004, the UK charity WaterAid reported that a child dies every 15 seconds from easily preventable water-related diseases; often this means lack of sewage disposal; see toilet.{{Citation needed|date=May 2018}}Organizations concerned with water protection include the International Water Association (IWA), WaterAid, Water 1st, and the American Water Resources Association. The International Water Management Institute undertakes projects with the aim of using effective water management to reduce poverty. Water related conventions are United Nations Convention to Combat Desertification (UNCCD), International Convention for the Prevention of Pollution from Ships, United Nations Convention on the Law of the Sea and Ramsar Convention. World Day for Water takes place on 22 March and World Ocean Day on 8 June.{{Citation needed|date=May 2018}}

In culture

Religion

Water is considered a purifier in most religions. Faiths that incorporate ritual washing (ablution) include Christianity, Hinduism, Islam, Judaism, the Rastafari movement, Shinto, Taoism, and Wicca. Immersion (or aspersion or affusion) of a person in water is a central sacrament of Christianity (where it is called baptism); it is also a part of the practice of other religions, including Islam (Ghusl), Judaism (mikvah) and Sikhism (Amrit Sanskar). In addition, a ritual bath in pure water is performed for the dead in many religions including Islam and Judaism. In Islam, the five daily prayers can be done in most cases after completing washing certain parts of the body using clean water (wudu), unless water is unavailable (see Tayammum). In Shinto, water is used in almost all rituals to cleanse a person or an area (e.g., in the ritual of misogi).In Christianity, holy water is water that has been sanctified by a priest for the purpose of baptism, the blessing of persons, places, and objects, or as a means of repelling evil.Chambers's encyclopædia, Lippincott & Co (1870). p. 394.Altman, Nathaniel (2002) Sacred water: the spiritual source of life. pp. 130–133. {{ISBN|1-58768-013-0}}.

Philosophy

The Ancient Greek philosopher Empedocles held that water is one of the four classical elements along with fire, earth and air, and was regarded as the ylem, or basic substance of the universe. Thales, who was portrayed by Aristotle as an astronomer and an engineer, theorized that the earth, which is denser than water, emerged from the water. Thales, a monist, believed further that all things are made from water. Plato believed the shape of water is an icosahedron which accounts for why it is able to flow easily compared to the cube-shaped earth.Lindberg, D. (2008). The beginnings of western science: The European scientific tradition in philosophical, religious, and institutional context, prehistory to A.D. 1450. (2nd ed.). Chicago: University of Chicago Press.In the theory of the four bodily humors, water was associated with phlegm, as being cold and moist. The classical element of water was also one of the five elements in traditional Chinese philosophy, along with earth, fire, wood, and metal.Water is also taken as a role model in some parts of traditional and popular Asian philosophy. James Legge's 1891 translation of the Dao De Jing states, "The highest excellence is like (that of) water. The excellence of water appears in its benefiting all things, and in its occupying, without striving (to the contrary), the low place which all men dislike. Hence (its way) is near to (that of) the Tao" and "There is nothing in the world more soft and weak than water, and yet for attacking things that are firm and strong there is nothing that can take precedence of it—for there is nothing (so effectual) for which it can be changed."WEB,weblink Internet Sacred Text Archive Home, Sacred-texts.com, 25 July 2010, Guanzi in "Shui di" 水地 chapter further elaborates on symbolism of water, proclaiming that "man is water" and attributing natural qualities of the people of different Chinese regions to the character of local water resources.Guanzi : Shui Di – Chinese Text Project. Ctext.org. Retrieved on 28 September 2015.

Dihydrogen monoxide hoax

Water's technically correct but rarely used chemical name, "dihydrogen monoxide", has been used in a series of hoaxes and pranks that mock scientific illiteracy. This began in 1983, when an April Fools' Day article appeared in a newspaper in Durand, Michigan. The false story consisted of safety concerns about the substance.weblink

See also

References

{{Reflist}}

Further reading

  • Debenedetti, PG., and HE Stanley, "Supercooled and Glassy Water", Physics Today 56 (6), pp. 40–46 (2003). Downloadable PDF (1.9 MB)
  • Franks, F (Ed), Water, A comprehensive treatise, Plenum Press, New York, 1972–1982
  • Gleick, PH., (editor), The World's Water: The Biennial Report on Freshwater Resources. Island Press, Washington, D.C. (published every two years, beginning in 1998.) The World's Water, Island Press
  • JOURNAL, Jones, Oliver A., Lester, John N., Voulvoulis, Nick, Pharmaceuticals: a threat to drinking water?, Trends in Biotechnology, 23, 4, 2005, 163–167, 10.1016/j.tibtech.2005.02.001,
  • Journal of Contemporary Water Research & Education
  • Postel, S., Last Oasis: Facing Water Scarcity. W.W. Norton and Company, New York. 1992
  • Reisner, M., Cadillac Desert: The American West and Its Disappearing Water. Penguin Books, New York. 1986.
  • United Nations World Water Development Report. Produced every three years.
  • St. Fleur, Nicholas. The Water in Your Glass Might Be Older Than the Sun. "The water you drink is older than the planet you're standing on." The New York Times (15 April 2016)

External links

{{Sisterlinks|water}} {{Water|expand}}{{Food chemistry}}{{Natural resources}}{{Molecules detected in outer space}}{{Authority control}}


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