## Equations of State for Photon Gas and Relativistic Electron Gas

This Insight develops equations of state that are useful in calculations about cosmology and about the insides of stars. The first calculation is for a photon gas and the second is for a ‘relativistic’ gas of particles with mass. Photon Gas Exercise 22 on p108 of Bernard Schutz’s ‘The first course in General Relativity (Second…