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Dynamic high pressure equation-of-state data are reported for 1,3- and 1,4-cyclohexadiene, cyclohexene, cyclohexane, toluene, and n-hexane initially in the liquid state. Plane shock waves generated by high explosives produced pressures of 0.5 to 43.0 GPa and densities to twice normal density. Toluene and n-hexane exhibit transformations at 12.6 and 19.0 GPa, respectively, but cyclohexadiene, cyclohexene, and cyclohexane do not. Decomposition of the molecule is the probable cause for the transition. Results indicate that reducing the number of double bonds by adding hydrogen pairs to the benzene molecule causes the transition to disappear. The shock velocity−particle velocity (us −Up) data for toluene, toluene, cyclohexadiene, and n-hexane are best represented by one or more line segments while cyclohexene and cyclohexane are fit by a quadratic in particle velocity. An extrapolation of the Us−Up curves to zero particle velocity result in a Us value for each liquid that is approximateley 40% higher than the bulk sound speed. The specific volume at a particular pressure for these liquids is ordered such that the hydrocarbon with the larger hydrogen-to-carbon ratio has a larger specific volume. This behavior is similar to that observed for other hydrocarbons.

Hugoniot data are presented for the liquid forms of the substituted methanes—dichloromethane, dibromomethane, di-iodomethane, and chloroform—ethylene glycol, glycerol, and ammonia. High explosive techniques were used to cover the range of dynamic pressures of 0.7 to 82.0 GPa. Chloroform transforms to a new form at 25.0 GPa pressure. Di-iodomethane data indicate a low pressure transition at 2.3 GPa and a second transition at a pressure greater than 66.0 GPa. The shock velocity–particle velocity (Us–Up) data for these two liquids are best represented by a linear relationship over the various forms. The Us–Up data for dichloromethane, dibromomethane, ethylene glycol, and glycerol are best fit by a quadratic expression in Up. Ammonia Us–Up data fit a linear relationship. Only dibromonethane and ammonia Us–Up curves extrapolate to the known sound speed. The others intercept at values that are 13% to 33% higher than the measured sound speed, indicative of low pressure transitions.

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Dynamic high pressure equation-of-state data are reported for liquid hydrogen and deuterium. Standard high explosive techniques were used to obtain the data from single and double shock compression. The shock velocity–particle velocity data on the principal Hugoniot curves are best fit by a quadratic expression in particle velocity. Intercepts of these expressions with the shock velocity axes agree very well with the measured sound speed. Over the pressure range studied, neither liquid exhibited a transition for the principal Hugoniot curves and no abnormal behavior was observed from the double-shock data. Theoretical Hugoniot curves for these liquids were computed using an equation of state from the Sesame library. The calculations agree with the measurements to within experimental error.

The Hugoniot of solid argon (initially at 75°K and approximately 1 bar) has been determined using standard shock-wave techniques. Sample pressures ranged 18–645 kbar with associated densities of 1.39–2.18 times the initial density of 1.65 g/cc. Utilizing an exp-6 interatomic potential, a computed fit was obtained which was in excellent agreement with the data up to 300 kbar. The deviation between theoretical and experimental Hugoniot above 300 kbar is interpreted as either due to melting or to an inadequate model and potential form.

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