Vaporizations of uranium hexafluoride were carried out in a heavy‐wall, nickel‐plated calorimeter. Measurements of the heat of vaporization of the solid were made at seven temperatures and of the liquid at four temperatures, covering the range from 4° to 90°C. The apparatus was tested before beginning the measurements by obtaining the heats of vaporization of water at three temperatures.The scattering of the data on UF6is about one percent. The measured heats of vaporization have been used to obtain a consistent correlation of the vapor pressures, heat of fusion, and triple point given in the literature. The results are expressed as vapor pressure equations and an equation of state for the saturated vapor. From these equations and the National Bureau of Standards values for the thermodynamic properties of the solid and liquid, the entropies of the ideal gas are calculated and compared with those given in the literature from spectroscopic data and molecular structure.
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