quantitykind:IsentropicExponent
$\textit{Isentropic Exponent}$ is a variant of $\textit{Specific Heat Ratio Capacities}$. For an ideal gas $\textit{Isentropic Exponent}$, $\varkappa$. is equal to $\gamma$, the ratio of its specific heat capacities $c_p$ and $c_v$ under steady pressure and volume.