The thermodynamics of the adsorption of gases on solids is developed in terms of a two-component system. It is shown that all solids swell during the adsorption process, and that spontaneous first-order phase changes in the adsorbed layer are unlikely. The ideal process: i(gas) → i(adsorbed)—constant environment—is introduced and discussed; thermodynamic functions appropriate to the process are defined. Two types of heat capacity of the adsorbed layer are defined and discussed. The chemical potential of a solid is treated at some length.
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R. J. Tykodi (1954) studied this question.
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