Pressure Calculation for Hot and Dense Gas Mixture

Based on the relativistic self-consistent average atom model, the orbital energies and wavefunctions for the bound electrons are calculated by solving the Dirac equations. The average occupation numbers at each orbital and the average ionization degree of each kind of atom are determined by the Fermi-Dirac distribution. The pressure of hot and dense gas mixtures is presented in terms of a quantum free electron gas, a quantum photon gas, and a classical ion gas. The pressure of Al, the mixture of Al and Mg, Fe, and the explosive HMX are calculated at certain temperatures and densities.