Equations of state for detonation problems

The words `Equation of State` have usually been used in the detonation physics community to mean whatever information about the materials involved that would make it possible to solve the problem at hand. As the problems have become more complicated and the computer simulation more detailed, better and better equations of state have been developed and used. Still, most equations of state have been limited to use in solving the hydrodynamic equations for an inviscid, non-heat-conducting, non-radiating, non-reacting fluid. All the information in these equations of state is about the mechanical properties. There is no information about the temperature, entropy, or specific heat. The focus of this paper is not on providing a new equation of state that will allow the solution of all problems, but to discuss the restrictions on equations of state, and the effect of those restrictions on their properties. Later, when there are more data, it will be time to search for the best equations of state for all the various problems