GetWiki
isolated system
ARTICLE SUBJECTS
being →
database →
ethics →
fiction →
history →
internet →
language →
linux →
logic →
method →
news →
policy →
purpose →
religion →
science →
software →
truth →
unix →
wiki →
ARTICLE TYPES
essay →
feed →
help →
system →
wiki →
ARTICLE ORIGINS
critical →
forked →
imported →
original →
isolated system
please note:
- the content below is remote from Wikipedia
- it has been imported raw for GetWiki
{{Use American English|date=January 2019}}{{Use mdy dates|date=January 2019}}{{Short description|Physical systems that don't interact with other parts of the universe}}{{For|the song|The 2nd Law}}{{see also|Thermodynamic system}}(File:Diagram Systems.svg|thumb|Properties of Isolated, closed, and open systems in exchanging energy and matter)In physical science, an isolated system is either of the following: - the content below is remote from Wikipedia
- it has been imported raw for GetWiki
- a physical system so far removed from other systems that it does not interact with them.
- a thermodynamic system enclosed by rigid immovable walls through which neither mass nor energy can pass.
Radiative isolation
For radiative isolation, the walls should be perfectly conductive, so as to perfectly reflect the radiation within the cavity, as for example imagined by Planck.He was considering the internal thermal radiative equilibrium of a thermodynamic system in a cavity initially devoid of substance. He did not mention what he imagined to surround his perfectly reflective and thus perfectly conductive walls. Presumably, since they are perfectly reflective, they isolate the cavity from any external electromagnetic effect. Planck held that for radiative equilibrium within the isolated cavity, it needed to have added to its interior a speck of carbon.Planck, M. (1914). The Theory of Heat Radiation, second edition translated by Masius, P. Blakiston's Son & Co., Philadelphia, p. 43.Fowler, R.H. (1929). Statistical Mechanics: the Theory of the Properties of Matter in Equilibrium, Cambridge University Press, London, p. 74.Landsberg, P.T. (1978). Thermodynamics and Statistical Mechanics, Oxford University Press, Oxford UK, {{ISBN|0-19-851142-6}}, pp. 208â209.If the cavity with perfectly reflective walls contains enough radiative energy to sustain a temperature of cosmological magnitude, then the speck of carbon is not needed because the radiation generates particles of substance, such as for example electron-positron pairs, and thereby reaches thermodynamic equilibrium.A different approach is taken by Roger Balian. For quantizing the radiation in the cavity, he imagines his radiatively isolating walls to be perfectly conductive. Though he does not mention mass outside, and it seems from his context that he intends the reader to suppose the interior of the cavity to be devoid of mass, he does imagine that some factor causes currents in the walls. If that factor is internal to the cavity, it can be only the radiation, which would thereby be perfectly reflected. For the thermal equilibrium problem, however, he considers walls that contain charged particles that interact with the radiation inside the cavity; such cavities are of course not isolated, but may be regarded as in a heat bath.Balian, R., (1982). From Microphysics to Macrophysics: Methods and Applications of Statistical Physics, translated by D. ter Haar, volume 2, Springer, {{ISBN|978-3-540-45478-6}}, pp. 203, 215.See also
References
{{Reflist}}{{Systems}}- content above as imported from Wikipedia
- "isolated system" does not exist on GetWiki (yet)
- time: 9:22am EDT - Sat, May 18 2024
- "isolated system" does not exist on GetWiki (yet)
- time: 9:22am EDT - Sat, May 18 2024
[ this remote article is provided by Wikipedia ]
LATEST EDITS [ see all ]
GETWIKI 23 MAY 2022
The Illusion of Choice
Culture
Culture
GETWIKI 09 JUL 2019
Eastern Philosophy
History of Philosophy
History of Philosophy
GETWIKI 09 MAY 2016
GetMeta:About
GetWiki
GetWiki
GETWIKI 18 OCT 2015
M.R.M. Parrott
Biographies
Biographies
GETWIKI 20 AUG 2014
GetMeta:News
GetWiki
GetWiki
© 2024 M.R.M. PARROTT | ALL RIGHTS RESERVED