Abstract
Ultrasonic absorption and velocity measurements have been made in pure liquid alkali metals at temperatures from their melting points to 250°C. Measured absorptions have been found to exceed the computed classical values by 10%–25%. Sound velocities decrease linearly with increasing temperature. The distilled liquid metals were transferred to the measurement apparatus under vacuum (better than 10−4 Torr) and measurements were made under a high-purity argon cover gas. No significant reaction with the cover gas was observed. No bonding agent was needed between the transducer and the clean liquid surface. [This work was supported by the Office of Naval Research.]
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