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A thermodynamic state function whose reversible differential heat transfer satisfies for a simple closed system. Entropy change is defined independently of whether an actual process is reversible.
wp-physics-entropywp-physics-laws-of-thermodynamicstong-statistical-physicsEach relation below ends at this concept.
This is an authored directed relation from the source endpoint to the target endpoint.
In equilibrium macroscopic regimes where a sharply concentrated macrostate count exists, yields the thermodynamic entropy. The statement depends on the macrostate partition and limit.
The target is recovered from the source either in a stated mathematical or asymptotic limit, or through a quantitatively controlled approximation with identified small parameters or omitted terms. The edge label and detail must state which case applies and its regime of validity.
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Equilibrium thermodynamics introduces entropy as a state function constrained by reversible heat relations and the second law.
The target represents a state, property, observable, or state-dependent description associated with the source system or theory.
wp-physics-entropywp-physics-laws-of-thermodynamicstong-statistical-physicsThis is an authored directed relation from the source endpoint to the target endpoint.
Under equilibrium, extensivity, and thermodynamic-limit assumptions, the appropriate ensemble entropy reproduces macroscopic thermodynamic entropy up to conventional additive constants. The relation can fail or require care for nonequivalent ensembles and long-range systems.
The target is recovered from the source either in a stated mathematical or asymptotic limit, or through a quantitatively controlled approximation with identified small parameters or omitted terms. The edge label and detail must state which case applies and its regime of validity.
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