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A\ curate data on the liquid density of a compound are a necessary prerequisite to the calculation of its thermodynamic properties. This paper covers in detail the results obtained in the measurement of the liquid densities of CHC1F2, CHC12F, CCI3F, and CC12F-CC1F2. It also includes the data obtained in the determination of the rectilinear diameters and critical constants of the four compounds.

Vapor pressure measurements have been made on difluorochloromethane (CHCIF2), dichlorofluoromethane (CHCI2F), trichlorofluorome thane (CCI3F), and trifluorotrichloroethane (CQ2F-CCIF2) at various pressures between 0.1 and 50 atmospheres.These data have been used to determine for each compound the constants of a vapor pressure equation of the form: logio p = A + -+ C logic T + DT The equations thus obtained have been used in the calculation of tables of thermodynamic properties for each compound. AS OUTLINED in the first paper of this series (1), a comprehensive investigation of the physical properties of the above four compounds was carried out in order to provide the information necessary for the calculation of their thermodynamic properties. This paper covers in detail the experimental work and the results obtained in the work on one property of these compounds-vapor pressure.The vapor pressure measurements were made by a static method using specially designed glass isoteniscopes. Since all nonpolar compounds have similar vapor pressure curves, the number of temperatures at which the vapor pressure measurements were made on each compound was limited to that which would accurately fix the position and slope of the vapor pressure curve over the desired range. To satisfy these requirements, it was found necessary to make determinations at pressures of approximately 0.3, 1, 3, 10, and 30 atmospheres on all four compounds and at pressures of 0.1 and 40-50 atmospheres on certain of them. These data were used to determine the constants of a vapor pressure equation for each compound.

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