Thermodynamic properties of liquid argon at high pressures, calculated from PVT and sound-velocity data

Abstract

Published PVT and sound-velocity data for liquid argon, at temperatures from 90 to 150 K, have been used to calculate the following properties at pressures up to the melting curve ( P max = 3000 atm): isothermal compressibility, adiabatic compressibility, thermal-expansion coefficient, thermal-pressure coefficient, configurational internal energy and specific-heat ratio ( C P / C V ). Reliable values of C P and C V at high pressures could not be derived from these data, because of uncertainties in the temperature derivatives of the PVT equation of state.