Entropy

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The entropy, S, is defined by

where is the Boltzmann constant and (sometimes written as ) is the number of microscopic configurations that result in the observed macroscopic description of the thermodynamic system.

Note that this equation provides a link between classical thermodynamics and statistical mechanics

Arrow of time

See Refs. 1 and 3.

See also:

References

  1. Milan M. Ćirković "The Thermodynamical Arrow of Time: Reinterpreting the Boltzmann–Schuetz Argument", Foundations of Physics 33 pp. 467-490 (2003)
  2. William G. Hoover "Entropy for Small Classical Crystals", Journal of Chemical Physics 49 pp. 1981-1982 (1968)
  3. Joel L. Lebowitz "Boltzmann's Entropy and Time's Arrow", Physics Today 46 pp. 32-38 (1993)