An Account of Thermodynamic Entropy

An Account of Thermodynamic Entropy

The second law of thermodynamics is an example of the fundamental laws that govern our universe and is relevant to every branch of science exploring the physical world. This reference summarizes ...
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Entropy in Statistical Mechanics

Pp. 41-49 (9)

Alberto Gianinetti

Abstract

The systems we can directly see are composed of huge numbers of particles. So, the properties of these systems are obtained as statistical averages of the effects of their particles. This casts a conceptual bridge between the macroscopic world wherein we observe systems with their overall properties and the microscopic world where particles with their own properties dominate the scene. Statistical mechanics shows that the former world is determined by what happens in the latter, and this approach provides a better, finer understanding of what’s going on at the macroscopic level and why.

Keywords:

Accessible microstates, Boltzmann entropy, Constraints, Equilibration, Gibbs entropy, Inertness, Macroscopically stable equilibrium, Maximum entropy, Maxwell-Boltzmann distribution, Microstates, Microscopically dynamic equilibrium, Phase space, Second law, Spreading function, Stability, Statistical mechanics, Thermodynamic ensemble, Trajectory.

Affiliation:

Council for Agricultural Research and Economics Genomics Research Centre, via San Protaso 302, 29017 Fiorenzuola d`Arda Italy.