That fraction of heat (energy) content not available for the performance of work, usually because (in a chemical reaction) it has been used to increase the random motion of the atoms or molecules in the system; thus, entropy is a measure of randomness or disorder. Entropy occurs in the Gibbs free energy (G) equation: ?G = ?H - T?S (?H, change in enthalpy or heat content; T, absolute temperature; ?S, change in entropy; ?G, change in Gibbs free energy).
[G. entropia, a turning toward]
See Also: second law of thermodynamics
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Examples: glitazone, GI cocktail, etc.