Sound-wave velocities in liquid alkali metals studied at temperatures up to 150°C and pressures up to 0.7 GPa

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Abstract
We have measured compressional sound-wave velocities in liquid sodium, potassium, rubidium, and cesium at pressures up to 0.7 GPa and temperatures up to 150 °C, by ultrasonic pulse transmission. The alkali metals are among the simplest of liquids and accurate data on the sound speeds allow the calculation of thermodynamic properties which may be used in the development of the theory of the liquid state. Most previous data are from P-V-T measurements, which are inherently less accurate than ultrasonic measurements.