β Scribed by R.M. Gibbons
No coin nor oath required. For personal study only.
Accurate PVT data were measured at low temperatures and high pressure by means of a specially constructed apparatus. The results of preliminary experiments with nitrogen at 72.3 K and 77.9 K agreed with the values of Van Itterbeek and Verbeke, and estabfished that the accuracy of the data was of the order of 0.15%. Other preliminary experiments showed that the capacity of the fill tube as a function of temperature and pressure could be calculated to within 2% for both nitrogen and neon.
This apparatus was used to measure 309 points on the PVT surface of neon between 27 K and 70 K, at pressures of up to 200 atm. From these data the saturated liquid and vapour densities, the entropy, enthalphy, second and third virial coefficients of the gas were calculated at several temperatures. The McCarty-Stewart equation agreed well with the data in the gas phase but was considerably in error for the liquid phase. There were systematic discrepancies of up to 2% in the compressibifity factor between these measurements and the data of Sulfivan and Sonntag at 70 K, but the saturated densities obtained agreed well with the data of Mathias, Crommelin, and Onnes.
π SIMILAR VOLUMES
## INTRODWCTiON for n-butane. This new equation of state was applied to the Recently, Brandani et al. (1992) have presented a new equa-correlation of thermodynamic properties for 10 pure polar tion of state based on theoretical results of a system of hard and nonpolar fluids. spheres with dipoles
Using the available thermodynamic data on liquid hydrogen, deuterium, and neon, and in addition our own measurements of the sound velocity in saturated liquid deuterium and neon, the density, sound velocity, and isentropic compressibility for saturated liquid Ne-nH2 and Ne-nD2 mixtures are calculate