Second law of thermodynamics/Definition

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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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