We report high frequency sound velocity measurements in superheated water in the temperature range from 100 to 220 °C at atmosphere pressure at 5 GHz. These results, obtained by Brillouin scattering, are in reasonable agreement with available data given by ultrasonic techniques, and the superheated water can be considered at 5 GHz as a nonrelaxing liquid up to 220 °C.The isothermal compressibility βT as deduced from the hypersound velocity v was fitted to a critical expression of the type βT=β0εx, with x=−0.97 and ε=(T*−T)/T*. T*≃588 K(315 °C) seems to be the limit temperature of stability of the liquid phase.
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Hareng et al. (1980) studied this question.
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