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The thermal expansion coefficient α of liquid normal hydrogen ( n -H 2 ) was measured between 18.8 and 22.2 K in the pressure range 5 to 70 bar. The results are compared with those derived from PVT measurements by others on both normal and para ( p -H 2 ) hydrogen. Our analysis of the earlier normal data includes fitting an empirical equation of state, and expansion coefficients are derived from this equation by differentiation. We discuss the effects on α and the compressibility β from molecular quadrupole interactions; both theoretical and empirical results suggest these to be on the order of 2% or less for the normal spin mixture. We conclude that our thermal expansion data are consistent with earlier results on both n -H 2 and p -H 2 in this range of pressures and temperatures.

Thermal Expansion of Liquid Normal Hydrogen Between 18.8 and 22.2 K