Time Evolution In Macroscopic Systems. II: The Entropy

Details Time Evolution In Macroscopic Systems. II: The Entropy Time Evolution In Macroscopic Systems. II: The Entropy

2003-03-15

arxiv.org/abs/cond-mat/0303291v1

Physics

Condensed Matter

Statistical Mechanics

28 pages

Scientific paper

10.1023/B:FOOP.0000012008.36856.

The concept of entropy in nonequilibrium macroscopic systems is investigated in the light of an extended equation of motion for the density matrix obtained in a previous study. It is found that a time-dependent information entropy can be defined unambiguously, but it is the time derivative or entropy production that governs ongoing processes in these systems. The differences in physical interpretation and thermodynamic role of entropy in equilibrium and nonequilibrium systems is emphasized and the observable aspects of entropy production are noted. A basis for nonequilibrium thermodynamics is also outlined

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