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New developments in science and industry are aided by accurate knowledge of the behavio r of important substances.The great abundance of chemical processes and compounds in which hydrogen is involved make it of partipular interest.The experimental a nd derived data presented here for hydrogen extend over a large range of temperature.Lo,,' temperat ures are required for the liquid and solid, and moderate and high temperatures occur in chemical reac tions.The avai lable thermal data [or H 2, HD, and D ~ in solid, liquid, and gaseous states have been brought together, includ in g the di s tinctive properties of ortho and para forms of H2 and D 2• Some data not previously publi ~h ed have been added.The thermal data include thermodynamic functions for the ideal gas state, equilibrium constants, data of s tate, viscosity, and thermal conductivity with dependence on the pressure, vapo r pressure, solid-liquid equilibria, specific heats, and latent heats.Values of state derivatives useful in t hermod ynamic calculations have been given for normal hydrogcn, and the related differences between thermodynamic functions for real and ideal gas states havc been evaluated• A temperat ure entropy diagram for normal H 2 in the range of experimen tal data is al 0 given.The compiled thermal properties of hydrogen are presented in 38 tables, 33 graphs, and numerous equations.The sources of the data have been given in an exten sive bibliography.
Woolley et al. (1948) studied this question.