Idealni plin.

Kod idealnog plina je $\rho(u)=\frac{\rho_0}{u_0}\,u,$ pa nakon uvrštenja u jednadžbu imamo

$$\frac{\gamma(x)\,\rho_0}{u_0}\,\frac{\partial u(x,t)}{\partial t... ...\rho_0}{\mu\,u_0}\,u(x,t)\,\frac{\partial u(x,t)}{\partial x}\right) + f(x,t),$$

odnosno

$$\gamma(x)\,\frac{\partial u(x,t)}{\partial t} = \frac{\partial}{... ...(x,t)\,\frac{\partial u(x,t)}{\partial x}\right) + \frac{u_0}{\rho_0}\,f(x,t).$$