Application of simple expressions for the high-pressure volumetric behaviour of liquid mesitylene

Abstract

Experimental pρT measurements of mesitylene (1,3,5-trimethylbenzene) obtained with an expansion technique have been used to calculate the molar density ρ and the mechanical coefficients κ_T(isothermal compressibility) and α_p(thermal expansion coefficient) as functions of pressure (up to 110 MPa or freezing pressure, when lower) and temperature (between 238 and 298 K). The whole data set has been used to confirm the ability of simple power functions to represent the experimental measurements as well as to test the possibility of using the functions for extrapolation. These expressions simultaneously relate the pressure dependence of the mechanical coefficients with the divergence pressure along the so-called pseudospinodal curve.