Thermodynamics of irreversible processes in a radiation field is formulated, based on kinetic theory, by treating nonequilibrium radiation as a nonequilibrium photon gas interacting with matter (e.g., a dilute plasma). A set of Boltzmann equations is taken for kinetic equations for...

The equivalent form for the entropy balance equation was derived in the paper entitled: Kinetic theory approach to irreversible thermodynamics of radiation and matter [Physica A 180 (1992) 65]. The Boltzmann gas analog of this equation gives a local form for the H theorem, but in its present...