Earlier experimental work has been extended to evaluate the effect of moisture on the Hugoniot of playa. For engineering applications the Hugoniot of moist playa can be predicted with sufficient accuracy from the Hugoniot of dry playa and water and the assumption of pressure equilibrium.nIsentropic release data were obtained for moist and dry playa. The steep release curve (in the P-V plane) from high pressure implies an irreversible phase change. Some low pressure data in the elastic-plastic region are presented.nA theoretical discussion of various forms of the Mie-Gruneisen equation and the physical basis of asymptotic statistical models is presented.nShock stability is reviewed. Phase transitions in which AV < 0 are classified according to the signs of the slopes of the coexistence curves. Relative slopes of Hugoniots and isentropes in the mixed phase region are calculated. The results of the theoretical discussion are applied to
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