Second law of thermodynamics/Definition

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< Second law of thermodynamics
Revision as of 06:50, 3 November 2009 by imported>Paul Wormer (New page: <noinclude>{{Subpages}}</noinclude> Entropy ''S'' is a state variable of a thermodynamic system; when a system of temperature ''T'' absorbs heat ''DQ'' reversibly, then ''dS'' = ''DQ''/''...)
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https://en.citizendium.org/wiki/index.php?title=Second_law_of_thermodynamics/Definition&printable=yes
A definition or brief description of Second law of thermodynamics.

Entropy S is a state variable of a thermodynamic system; when a system of temperature T absorbs heat DQ reversibly, then dS = DQ/T; during an irreversible (spontaneous) state change dS > DQ/T.

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