ON THE DIFFUSION OF ADSORBED GASES THROUGH SOLIDS

Abstract

The equations for the diffusion of an adsorbed gas through a solid are developed on the assumption that the resistive force is directly proportional to the number of molecules adsorbed, that is, that the resistive force per molecule is constant. The equations are compared with experiment and also with the equations developed in an earlier paper where the assumption was made that the resistive force per molecule is inversely proportional to the number of molecules adsorbed. The equations developed here are not as satisfactory as those developed earlier and it is pointed out that this is a consequence of the fact that heats of adsorption have been found experimentally to decrease as the amount of adsorbed gas increases.