The vapor pressure of uranium hexafluoride, UF6, has been measured from 273°K to 358°K. The measurements were made by a null method in an all metal apparatus with a brass sylphon bellows. The data are represented by the equations:Solid−vapor log10P(mm Hg)=−3.77962 log10T−(3123.479/T)+21.87103,Liquid−vapor log10P(mm Hg)=−3.72662 log10T−(2065.679/T)+18.60033.The constants in the equations were adjusted so that the equations would give the same heat of fusion and triple‐point temperature as was determined by Brickwedde, Hoge, and Scott. The vapor pressure at the triple point is 1133±7 mm. The sublimation point at which the vapor pressure is 1 atmosphere is 56.5°C. The heat of vaporization has been calculated using the Berthelot equation to obtain the vapor volume. From this and the entropies measured by Brickwedde, the absolute entropy of the gas has been calculated.
展开▼
