Pressure dependence of expansivity in the liquid hexane as a model for liquids

Abstract

Along isothermal paths, the expansivity of liquid hexane is shown to follow a power law up to a few hundred MPa. The pole of this function is found to be close to the expected limits of thermodynamic stability (spinodal) of the liquid state. Analysis of argon and carbon dioxide data shows that the model may be extended to other liquids. A similar equation may be used to fit the isothermal compressibility data.