The walls of an empty chamber are held at constant temperature. the chamber is thus a repository for electromagnetic energy waves. the empirical equstions of state for thiselectromagnetic cavity are : U=bVT^4 ( the " stefan - boltzmann law ") where b is a constant and p= U/3V . (NOTE; the cavity is empty and so we will not consider there to be count of the number of particles n . Hence any fundamental relation will not need to depend on n . )
a. Construct the fundamental relation?