Temperature dependence of the acentric factor of normal hydrogen, orthohydrogen and parahydrogen

Abstract

Abstract Temperature-dependence correlations of vapor pressure and acentric factor for normalhydrogen(n-H2), orthohydrogen(o-H2) and parahydrogen(p-H2), have been formulated. The obtained correlations are statistically excellent. The characteristic parameters such as the Pitzer’s acentric factor, Riedel’s parameter, Filippov’s parameter have been determined for n-H2, o-H2 and p-H2. And, the curvatures of vapor pressure curve for n-H2, o-H2 and p-H2 have been determined in a wide range of temperature. It is found that the curvatures of vapor pressure curve for n-H2, o-H2 and p-H2 have a maximum at about 17.11K, 17.12K and 17.00K, respectively.