Pressure—volume behavior of two capillary liquids

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Abstract

Adsorption isotherms for trichlorofluoromethane and carbon tetrachloride on a commercial silica gel are reported. All isotherms are type I and exhibit hysteresis. At relative pressures greater than the lower closure point of the hysteresis loop the adsorbates can be regarded as capillary liquids at negative pressure. The molar volumes of the capillary liquids are greater than those of the corresponding bulk liquids, and the dependence of molar volume on pressure is well represented by an equation of state proposed by R. J. Speedy (J. Phys. Chem. 80, 982, 1982). The compressibilities of the capillary liquids are greater than those of the corresponding bulk liquids.

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