Acoustic and Thermodynamic Properties of Benzene and Cyclohexane as a Function of Pressure and Temperature

Abstract

The phase comparison pulse echo method with two reflectors has been used to determine the velocity of sound in benzene and cyclohexane in the temperature range from 283–323 K and up to the freezing pressures of the liquids, the maximum pressures being 170 and 80 MPa respectively. The density, the isothermal compressibility, the isobaric thermal expansion and the specific heat at constant pressure of both liquids have been evaluated from the measured sound velocity, using a computational method similar to that of Davis and Gordon. The calculated densities for both liquids agree well with those found in the literature.