The thermodynamics of the adsorption of gases on solids is developed in terms of a twohyphen;component system. It is shown that all solids swell during the adsorption process, and that spontaneous firsthyphen;order phase changes in the adsorbed layer are unlikely. The ideal process:i(gas) rarr;i(adsorbed)mdash;constant environmentmdash;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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