Abstract
With some exceptions, the densities of compressed liquids can be correlated accurately by a three-constant system of corresponding states. This method is based on the linearity of the unit-compressibility line, and the constancy of the ratio of the deviations from unit compressibility of two different liquids at equal reduced temperatures and densities. Each set of experimental measurements taken from the literature is characterized by a Boyle temperature, a unit-compressibility density, and a relative Boyle volume. In many cases the density of one liquid as a function of temperature and pressure can then be calculated within the reported experimental error from pvt measurements on another liquid.
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