THE THERMODYNAMICS OF THE GRAPHITECARBON VAPOR SYSTEM.

The purpose of this study is the thermodynamic investigation of graphite over a range of temperatures up to 6000K and pressures up to 10 to the 3rd atmospheres. Two sets of equilibrium composition equations were used--one representing a pure gas phase, the other a heterogeneous system of gas and solid carbon. The heterogeneous chemical system is unique in that, although it involves two phases and a variety of chemical species, it comprises only one chemical element. The mathematical solution of the system of equations representing the heterogeneous chemical system was subject, therefore, to the physical constraint of one degree of freedom. The results of the computational program are presented in both tabular and graphic form. The latter is a conventional Mollier diagram in which specific enthalpy is plotted against specific entropy, with cross plots of temperature, pressure, molecular weight, and moles of condensed carbon. Author