Heat: Difference between revisions
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:<math>\delta Q= TdS</math> | :<math>\delta Q= TdS</math> | ||
where ''T'' is the [[temperature]] and ''S'' is the [[entropy]]. | where ''T'' is the [[temperature]] and ''S'' is the [[entropy]]. <math>\delta</math> represents an [http://mathworld.wolfram.com/InexactDifferential.html inexact differential], indicating that the resulting value depends on the path taken. This equation is an equality when the process is reversible, i.e., the system evolves through a succession of equilibrium states. If the process is irreversible one has | ||
:<math>\delta Q < TdS</math> | |||
==See also== | ==See also== | ||
*[[First law of thermodynamics]] | *[[First law of thermodynamics]] | ||
*[[Second law of thermodynamics]] | |||
*[[Heat flow]] | |||
==References== | ==References== | ||
<references/> | |||
;Related reading | |||
*[http://dx.doi.org/10.1021/ed047p357 Leonard K. Nash "Reversible and irreversible heating and cooling", Journal of Chemical Education '''47''' pp. 357-361 (1970)] | |||
[[category: classical mechanics]] | [[category: classical mechanics]] | ||
[[category: statistical mechanics]] | [[category: statistical mechanics]] | ||
Latest revision as of 10:24, 5 July 2011
The heat, Q is given by
where T is the temperature and S is the entropy. Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \delta} represents an inexact differential, indicating that the resulting value depends on the path taken. This equation is an equality when the process is reversible, i.e., the system evolves through a succession of equilibrium states. If the process is irreversible one has
- Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \delta Q < TdS}
See also[edit]
References[edit]
- Related reading