The theory of classical or equilibrium thermodynamics is idealized. The ISM is usually far from thermodynamic equilibrium. One may imagine two such cavities, each in its own isolated radiative and thermodynamic equilibrium. Classical thermodynamics deals with states of dynamic equilibrium. For quantification, see the equation in the article on solubility equilibrium. This price results in a stable economic equilibrium. Wien considered adiabatic expansion of a cavity containing waves of light in thermal equilibrium. There are some further constraints upon the sustaining of a Stackelberg equilibrium. One can also define averages over states for systems perturbed slightly from equilibrium. An arbitrage equilibrium is a precondition for a general economic equilibrium. Phase transitions occur along lines of equilibrium. The symmetric Nash equilibrium is at formula 72. It explains and predicts behaviors of solutions in dynamic equilibrium. Bases accelerate the hydrolysis, which is subject to the Fischer equilibrium mentioned above. It is possible to implement such systems in subgame perfect equilibrium.