Experimental measurements on nitrogen condensation in silica pores of 70, 117, and 159 Å diameters give measured values of the surface tension in reasonable agreement with computed results based on a very simple thermodynamic model of a fluid interface. Adsorption and desorption isotherms are drawn by recording the dielectric susceptibility of the fluid at microwave frequencies. Hysteresis loop in pores of 159 Å diameter accurately fit a theory published earlier by Saam and Cole.
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