Equation of state for fluid hydrogen-isotopes H2, D2, and T2 up to their freezing points at 300 K

Abstract

The calculations of the P-V isotherms of fluid hydrogen isotopes H2, D2, and T2 up to their freezing pressures around 55 kbar at 300 K have been performed by using the modified hard-sphere variational perturbation theory with a quantum correction for four kinds of intermolecular potentials. The results by the use of the potentials of Silvera-Goldman and Nellis et al. agreed well with the experimental equation of state. The quantum pressures (ΔP) were estimated as a function of volume for H2, D2, and T2 at 300 and 200 K, and the dependences of ΔP on volume, molecular mass, and temperature were discussed.