THERMODYNAMIC PROPERTIES OF NITROGEN FROM 300 TO 5000K AND FROM 1 TO 1000 AMAGATS
ARO INC ARNOLD AFS TN
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Tables for the thermodynamic properties of equilibrium nitrogen are presented at intervals of log rho 0.2, the density rho in amagats extending from one to 1000 amagats, and at intervals of 100 deg in temperature from 300 to 5000K. In accordance with full discussion in the text of the report, the compressibility factor Z at 300 and 400K is extrapolated to 1000 amagats by linear extrapolation of log Z-1 against log rho at constant temperature. At 3000 and 5000K the values of Z are found from published virial coefficients. Interpolations between these extremes of temperature are based on an empirical equation for the pressure-temperature lines at constant density, the form of which fits known data at medium densities and also predicts data at temperatures below 300K. The values of the dimensionless thermal functions ERT internal energy and SR entropy are based on numerical integrations of Z and its derivative delta Zdelta T sub, using known values of these functions at one amagat as constants of integration. This method of determining the thermal functions is validated by showing that it reproduces a set of known tables to a high degree of accuracy.