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An equation of state for water, applicable in the pressure range 25 kilobars to 250 kilobars, is formulated in terms of experimental data obtained from shock wave measurements. This equation of state is used to calculate P-V relations for several adiabats and isotherms. Thermodynamic and hydrodynamic data along the Hugoniot curve are given as a function of shock pressure, and pressure-particle velocity relations for initial shocks followed by reflected shocks and rarefactions are given.

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The high-velocity c o llisio n of two solids is discussed as a problem in compressible fluid hydrodynamics. Such c o llisio n s nay conveniently he divided into J e tle s s and jet-farm ing categ o ries. A theory 1s presented which describes flow in ths c o llisio n region fo r the je tle s s osse, end determines a c r i t i c a l c o llisio n angle (as s function of m aterial v elo cities and equalion-of-state p roperties of the m aterials) above which a J e t au st a ris e from the collision* The experimental study of so lid c o llisio n s u tiliz e s metal p lates driven by high explosives, the c o llisio n process being re corded with • high-speed smear earners* Two experimental arrangements are used, and data fo r c o llisio n s employing dural, mild s te e l, brass and lead are presented, Jetl* ss and jet-form ing c o llisio n s are observed, and c r i t i c a l angles separating the two types are compared with th eo re tic al predictions, Agreement seems satisfac to ry to indicate th a t the theory is v elid .- .