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Isothermal compressibilities of seven organic liquids have been determined by analytical ultracentrifuge techniques, in good agreement with literature values obtained by other methods.A least squares regression equation was derived that correlated the logarithmic values of isothermal compressibilities of 7 organic liquids, determined experimenrally, with the liquids' surface tensions. This equation was shown to be valid for 11 other organic liquids (values obtained from literature) over a temperature range of 0" through SO' , and a s~lrface tension range of 13 to 44 dyn per cm.Nous avons determine la compressibilite isothermique pour 7 liquides organiques, avec l'ultracentrifugeuse analytique. Nos valeurs sont toujours semblables a celles determines par d'autres methodes.Une equation des moindres carrts a tte deconverte entre le logarithme des valeurs des compressibilitts isothermiques des 7 liquides, et de leurs tenslons superficielles. Cette equation est valide pour 11 autres liquides organlques (valeurs des compressibilites obtenue dans la litterature) ayant des tensions superficielles de 13 a 44 dyn/cm et entre les temperatures de 0 a 50 "C.

The isothermal compressibility has been determined for the methyl ketones from acetone to 2-decanone. These data correlate well with surface tension, and from this correlation it is possible to calculate the variation of surface tension with pressure for the compounds. The apparent change in refractive index of liquids with pressure as measured in schlieren optics compared with the same function obtained by interferometry gives the change in polarizability of the liquid with density as predicted by the Lorentz-Lorenz equation.

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