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Literature values of the vapor pressures of H/sub 2/, HD, D/sub 2/, N/ sub 2/, O/sub 2/, Ne, Ar, Kr, Xe, CO, NO, CH/sub 4/, N/sub 2/O, CO/sub 2/, HCl HBr, HI, SF/sub 6/, H/sub 2/S, Cl/sub 2/, Br/sub 2/, NH/sub 3/, C/sub 2/H/sub 2/ , SO/sub 2/, SO/sub 3/, COCl/sub 2/, HF, HCN, N/sub 2/O/sub 4/, CCl/sub 4/, and SnCl/sub 4/ were compared with the Kirchhoff formula log PK = --A/T + B between the normal boiling point and the critical point, where A and B are determined for each liquid. Plots are presented of the deviations computed by the equation: d = PK -- P b. Based on accurately determined curves for 17 of these substances, empirical hypotheses were developed to allow the prediction of the most probable course of the deviation curve in cases where the data appeared to be unreliable. In addition, where precise data were available, the possibility of the existence of fine structure curvature was demonstrated. The deviation curves were used to obtain tables of interpolated vapor pressure values which are, in most cases, more accurate by one order of magnitude than any now in the literature, particularly where smoothed regression curves do notmore » discriminate between random experimental errors and systematic deviations of an arbitrarily chosen formula from the real vapor pressure curve. Since the deviation curve is invariably shown to approach the zero ordinate at the critical point with a large negative slope, the correspondence between the critical pressure and temperature is fixed with a high degree of confidence. A particular result of this work is that the critical pressure of NH/sub 3/ was shown to be about one atmosphere higher than the presently accepted value. The new values for the critical points of CH/sub 4/ , C/sub 2/N/sub 2/, HCN, and Br/sub 2/ also resolved differences existing between various authorities in the literature. (auth)« less

THE VAPOR PRESSURES OF 30 INORGANIC LIQUIDS BETWEEN ONE ATMOSPHERE AND THE CRITICAL POINT