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The standard theory of ideal gases ignores the interaction of the gasparticles with the thermal radiation (photon gas) that fills the otherwisevacuum space between them. This is an unphysical feature of the theory sinceevery material in this universe, and hence also the particles of a gas, absorbsand radiates thermal energy. The interaction with the thermal radiation that iscontained within the volume of the body may be important in gases since thelatter, unlike solids and liquids, are capable of undergoing conspicuous volumechanges. Taking this interaction into account makes the behaviour of the idealgases more realistic and removes Gibbs' paradox.

Interaction with thermal radiation in the free expansion and mixing of ideal gases and Gibbs' paradox in classical thermodynamics