THE EQUATION OF STATE FOR SOLID HYDROGEN ON THE MELTING CURVE

The measurements of pressure P(m) and molar volume V(m) for solid hydr ogen and deuterium as functions of temperature along the melting line have been developed for the pressure region up to 60 MPa by using a di electric method and experimental installation developed by the authors . The influence of zero translational vibrations on the melting of sol id gases was investigated on the basis of adiabatic criteria of meltin g. Values of V(m)(T) for both isotopes measured in this paper, as well as the literature data on V(m)(T) for H-2 and D2 for P(m) up to appro ximately 10(3) MPa are described by a unified equation which is the th ermodynamic result of this criterion.