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| :<math>\delta Q= TdS</math> | | :<math>\delta Q= TdS</math> |
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| 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 | | where ''T'' is the [[temperature]] and ''S'' is the [[entropy]]. |
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| :<math>\delta Q < TdS</math>
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| ==See also== | | ==See also== |
| *[[First law of thermodynamics]] | | *[[First law of thermodynamics]] |
| *[[Second law of thermodynamics]]
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| *[[Heat flow]]
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| ==References== | | ==References== |
| <references/>
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| ;Related reading
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| *[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)]
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| [[category: classical mechanics]] | | [[category: classical mechanics]] |
| [[category: statistical mechanics]] | | [[category: statistical mechanics]] |