Abstract
Casado, Massie and Whytlaw-Gray1 measured the density of five organic vapours at 22° C with a quartz-fibre microbalance and obtained results which permit the calculation of second virial coefficients. However, with acetone, the data imply a contribution over the experimental pressure range (26–136 mm) of a positive third virial coefficient sufficiently large to cause a two-fold change in the slope of the PV/P line, a finding quite at variance with Lambert's2 linear isotherms. Work on acetone by Pennington and Kobe3 and Zaalishvilli and Kolysko4 was conducted by methods which do not provide direct evidence on the PV/P curvature. Recent PVT determinations at sub-atmospheric pressure for other organic compounds boiling near 50° C indicate that any supposed curvature is scarcely distinguishable from observational errors.
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Casado, F. L., Massie, D. S., and Whytlaw-Gray, R., Proc. Roy. Soc., A, 214, 466 (1952).
Lambert, J. D., Roberts, G. A. H., Rowlinson, J. S., and Wilkinson, V. J., Proc. Roy. Soc., A, 196, 113 (1949).
Pennington, R. E., Kobe, K. A., J. Amer. Chem. Soc., 79, 300 (1957).
Zaalishvilli, Sh. D., and Kolysko, L. E., J. Phys. Chem. (Russian), 34, 1223 (1960).
Bottomley, G. A., Reeves, C. G., and Whytlaw-Gray, R., Proc. Roy. Soc., A, 246, 504 (1958).
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BOTTOMLEY, G., SPURLING, T. Acetone Isotherms. Nature 195, 900 (1962). https://doi.org/10.1038/195900a0
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DOI: https://doi.org/10.1038/195900a0
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