In thermodynamics, Boltzmann entropy refers to the H-theorem, introduced by Austrian physicist Ludwig Boltzmann in his famous 1872 paper “Further Studies on the Thermal Equilibrium of Gas Molecules”, which statistically quantifies the entropy of an ideal gas system. [1]

See also
Clausius entropy
Gibbs entropy

References
1. Boltzmann, Ludwig. (1872). "Further Studies on the Thermal Equilibrium of Gas Molecules" (“Weitere Studien über das Wärmegleichgewicht unter Gasmolekülen”), in Sitzungsberichte der Akademie der Wissenschaften, Mathematische-Naturwissenschaftliche Klasse (pgs. 275-370), Bd. 66, Dritte Heft, Zweite Abteilung, Vienna: Gerold.

External links
Boltzmann entropy – Wikipedia.

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