Relativistic ideal gas. Consider a dilute gas of N indistinguishable massless particles enclosed in a box of side length L and volume V : L3 at temperature 7'. The particles\" energies e and momenta p are related by e = |p|c, Where c is the speed of light. As with the nonrelativistic ideal gas, the states can be indexed by n 2 (nm, any, 713), with _1rh