Abstract
On the basis of an analysis of the closure points of the hysteresis loops of adsorption isotherms of argon, benzene, water, and other substances, the authors prove that for all adsorbates the mechanism of capillary condensation in the transitional pores ceases to hold good at a characteristic relative pressure the value of which is typical of the adsorbate in question. They explain this phenomenon by desorption of the adsorbates from pores at a relative pressure at which the stress in the adsorbate reaches the tensile strength. The mechanism of adsorption of water on active charcoal is discussed.
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