Thet-curve of multimolecular N2-adsorption

Abstract Experimentally an identical multimolecular adsorption curve of nitrogen at liquid nitrogen temperature is found for a wide variety of adsorbents, provided no capillary condensation occurs and no narrow pores are put out of action in the course of progressing adsorption. This curve, at present known for relative pressures between 0.10 and 0.75, can be expressed in terms of an average thickness of the adsorbed layer (the t -curve). When experimental adsorption data on microporous adsorbents are plotted as a function of this t -curve, the t -plot obtained gives direct information about the specific area, the capillary condensation, the width of pores, etc. Two equations may describe the t -curve more or less adequately; the theoretical nonsignificance or significance of this is discussed.