Abstract
With high pressures at elevated and supercritical temperatures fluids can be studied over a very wide range of density. Fluids with strongly interacting polar molecules - for example water - are of particular interest. Results for several thermophysical properties are presented. PVT-data of sodium, high pressure-high temperature viscosity of decane and the dielectric constant of supercritical water-benzene mixtures are discussed. The continuous transition from ionic to metallic states is shown with the cesium-cesium hydride system to 800 °C. High pressure far-infrared spectroscopy reveals the dynamics of compressed polar methyl halides. Quantitative determinations of the solubility of solids in dense supercritical gases are presented. A number of phase diagrams and critical curves of binary aqueous systems to 400 °C and 2000 bar have been determined. A new rational equation of state for such systems is presented. “Hydrothermal” combustion of methane in supercritical water is possible and a flame, burning at 1000 bar is shown.
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