Kinetic pressure of an isotropic gas
= Kinetic pressure of an isotropic gas
For an isotropic gas, averaging the momentum flux over directions gives
$$
P=g\int\frac{d^3p}{(2\pi)^3}\frac{\mathbf p^2}{3E(\mathbf p)}f(\mathbf p).
$$
= Kinetic pressure of an isotropic gas
For an isotropic gas, averaging the momentum flux over directions gives
$$
P=g\int\frac{d^3p}{(2\pi)^3}\frac{\mathbf p^2}{3E(\mathbf p)}f(\mathbf p).
$$