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Centimetre of water

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Centimetre of water
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A centimetre of water (US spelling centimeter of water, abbreviated cm{{H2O}} or cm H2O) is a less commonly used unit of pressure derived from pressure head calculations using metrology. It may be defined as the pressure exerted by a column of water of 1 cm in height at 4 °C (temperature of maximum density) at the standard acceleration of gravity, so that {{nowrap|1 cmH2O (4°C)}} = {{nowrap|999.9720 kg/m3}} × {{nowrap|9.80665 m/s2}} × 1 cm = {{nowrap|98.063754138 Pa}} ≈ {{nowrap|98.0638 Pa}}, but conventionally a nominal maximum water density of {{nowrap|1000 kg/m³}} is used, giving {{nowrap|98.0665 Pa}}.It is frequently used to measure the central venous pressure, the intracranial pressure while sampling cerebrospinal fluid, as well as determining pressures during mechanical ventilation or in water supply networks (then usually in metres water column). It is also a common unit of pressure in the speech sciences. This unit is commonly used to specify the pressure to which a CPAP machine is set after a polysomnogram.
{|
1 cmH2O (conventional)}} = 98.0665 pascalsnist.gov – Guide for the Use of the International System of Units (SI) page 47, 2008 Edition
|= 0.01 metre water (mH2O), metre water column (m wc) or metre water gauge (m wg)
Millimeters, water gauge>mm wg
bar (unit)>mbar or hPa
Inch of water>inH2O
atmosphere (unit)>atm
|≈ 0.735559240069085 torr
Millimeter of mercury>mm Hg
inch of mercury>inHg
pounds per square inch>psi

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- content above as imported from Wikipedia
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- time: 9:02pm EST - Fri, Nov 15 2019
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