The variation of volumetric isentropic exponent and temperature isentropic exponent of the gas mixture of nitrogen(N2)and fire extinguishing agent vapor with pressurized pressure and temperature are a key influential factor to the fire extinguishing agent discharge progress for the aircraft fire extinguishing system.Based on the PR(Peng-Robinson)equation associated with the classical van der Waals mixing rule,aprogram was developed to estimate volumetric isentropic exponent and temperature isentropic expone...