Measure of the disorder of a system.

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, Isentrope, Isentropic, Standard Entropy of Reaction, Thermodynamic Properties, Third Law of Thermodynamics.

Previous PageView links to and from this pageNext Page

Subjects: Thermodynamics