Model of multilayer adsorption is a random distribution of molecules on the material surface . ]]
2.
"' Capillary condensation "'is the " process by which multilayer adsorption from the vapor [ phase ] into a porous medium proceeds to the point at which pore spaces become filled with condensed liquid from the vapor [ phase ] . " The unique aspect of capillary condensation is that vapor condensation occurs below the saturation vapor pressure, P sat, of the pure liquid.