The Isentropic Exponent of Single-Ionized Mono-Atomic Plasmas

The isentropic exponent of single-ionized mono-atomic plasmas in thermal equilibrium is studied. Its behavior as a function of the ionization degree and temperature is examined for argon and zinc plasmas at two pressures (1 bar and 1 mbar, 1 mPa and 1 Pa), respectively. The results show that for the two sorts of plasma the isentropic exponent equals typically about 1.1−1.2 within a considerably wide range of the ionisation degree (5−80%).