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.

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This paper presents a detailed description of apparatus used and the results obtained in the following measurements relating to the thermodynamic properties of 1,3-butadiene in the solid, li quid, and vapor states: (1) Specific heats from -258 0 to + 30 0 C, (2) heat of fusion, (3) heats of vaporization from -26 0 to + 23 0 C, (4) vapor pressures from -78 0 to + 110 0 C (5) liquid densities from -78 0 to + 95 0 C, (6) vapor densities from 30 0 to 150 0 6, and (7) the critical pressure, volume, and temperature of 1,3-butadiene. Tables embodying the results of these measurements are included for specific heats, enthalpy, and entropy of the soli'd, liquid, and vapor.