THE vapor pressures of pure perfluoro-n-butane, perfluoromethylcyclohexane, perfluorodimethylcyclohexane, and perfluoro-n-heptane were determined.Heats and entropies of vaporization were calculated.Critical constants of perfluoro-n-butane, perfluoro-n-heptane, and perfluoromethylcyclohexane were evaluated, and boiling points, densities, refractive indices, surface tensions, and viscosities are given for a number of pure fluorocarbons. The behavior of some fluorocarbons towards hydrolysis was also studied.AFTER the preparation of a number of pure fluorocarbons by the method of synthesis described in previous papers of the current series (1), a demand for the determination of some of their

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