4.1 Article

Free expansion of an ideal gas by kinetic gas theory

期刊

EUROPEAN JOURNAL OF PHYSICS
卷 43, 期 6, 页码 -

出版社

IOP Publishing Ltd
DOI: 10.1088/1361-6404/ac93cb

关键词

ideal gas; free expansion; kinetic gas theory; thermodynamics

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This excerpt discusses the adiabatic free expansion of an ideal gas, exploring the energy difference between escaping and remaining gas and its relationship with classical thermodynamics.
We consider the adiabatic free expansion of an ideal gas. According to classical thermodynamics, the internal energy of the gas is not affected by the expansion, but kinetic gas theory predicts an average energy difference between escaping and remaining gas. This difference is transient if the gas escapes into a finite volume, consistent with the equilibrium prediction of classical thermodynamics. For escape into an infinite volume, classical thermodynamics is not applicable. Numerical calculations of the magnitude of the predicted effect are provided.

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