The thermodynamic properties of 20.4K-equilibrium hydrogen is presented for pressures between 1 and 3000 psia and temperatures between 25 and 5000 R. Several graphical representations of the data are given. These consist of temperature enthopy, enthalpy-entropy, pressure-enthalpy, temperature-enthalpy, and temperature-density diagrams. Data are given to show the effect of ortho-para composition of hydrogen properties over the range of temperatures considered. Hightemperature gas properties shown include the effects of dissociation and non-ideal gas behavior.

The thermodynamic properties of 20.4K-equilibrium hydrogen is presented for pressures between 1 and 3000 psia and temperatures between 25 and 5000 R. Several graphical representations of the data are given. These consist of temperatureenthopy, enthalpy-entropy, pressure-enthalpy, temperature-enthalpy, and temperature-density diagrams. Data are given to show the effect of ortho-para composition of hydrogen properties over the range of temperatures considered. Hightemperature gas properties shown include the effects of dissociation and non-ideal gas behavior.

Pressure, volume, temperature, internal energy, enthalpy, and entropy of normal hydrogen gas have been tabulated along isobars temperature to 300°K and from a pressure of 1 to 100 atmospheres. The source of data is the Research Paper 1932 of the National Bureau of Standards Journal of Research. The method is described by which the data presented in Research Paper 1932 is reduced to properties directly useful for engineering calculations. A method is also described for estimating the effect of ortho-para compositions upon the tabulated properties. Tabular values are presented in the dimensional units of the metric system. The tabulations are also available in the dimensional units of the British system as Technical Note no. 120, Supplement A.