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Ultrafast acoustics measurements on liquid mercury have been performed athigh pressure and temperature in diamond anvils cell using picosecond acousticinterferometry. We extract the density of mercury from adiabatic soundvelocities using a numerical iterative procedure. The pressure and temperaturedependence of the thermal expansion, the isothermal compressibilty, theisothermal bulk modulus and its pressure derivative are derived up to 7 GPa and520 K. In the high pressure regime, the sound velocity values, at a givendensity, are shown to be only slightly dependent on the specific temperatureand pressure conditions. The density dependence of sound velocity at lowdensity is consistent with that observed with our data at high density in themetallic liquid state.

Thermodynamic properties of liquid mercury to 520 K and 7 GPa from acoustic velocity measurements