Abstract
1. The osmotic theory of adsorption equilibrium has been extended by deriving and experimentally testing a thermodynamically exact, five-parameter, thermal-adsorption equation. This equation gives a good description of zeolite adsorption of xenon and krypton, being applicable over a wide range of temperatures, pressures, and adsorptions, the latter ranging down to extremely low packing values. 2. The excess entropy is equal to zero for various types of gas adsorption on activated charcoals. Here the temperature variation of the equilibrium can be established from a single adsorption isotherm and a value of the heat of adsorption determined at a single point on some other isotherm.
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