Entropy

Measure of the disorder of a system.

where
S = Experimental entropy
dQrev = Heat supplied to system, reversible change
dQ = Heat supplied to system
T = Temperature

Any spontaneous change disperses energy and increases entropy overall.

Example: when water evaporates, the internal energy of the water is dispersed with the water vapour produced, corresponding to an increase in entropy.

See also: Clausius, Rudolph Julius Emmanuel, Standard Entropy of Reaction, Thermodynamic Properties, Third Law of Thermodynamics.

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Subjects: Thermodynamics