Application of the linear isotherm regularity to selected fluid systems

Dense hard-sphere and Lennard-Jones fluids and also liquid mercury and water are studied to see if they obey the linear isotherm regularity suggested by Parsa, far and Mason. For dense hard-sphere fluids a behavior consistent with the regularity is observed. Data from simulations of the Lennard Jones fluid were observed to follow the trends proposed by the regularity. For mercury, agreement between the experimental data and the predictions of the regularity is obtained. This suggests that the scope of the regularity can be extended to include liquid metals. In the case of water, Ibr pressure ranges that are not too large, quantitative agreement with the predictions of the regtdarity can be obtained. Over larger ranges of pressure, systematic deviations appear, but the agreement is still satislactory. Based on the model previously proposed for the regularity, a discussion of some aspects of the parameters in the equation is given.