Abstract
Because of the high values of wave velocity and density and the low value of viscosity in gallium, the Stokes-Kirchoff value of α/f2 is only 1.6×10−17 sec2 cm−1, of which approximately 75% is due to the thermal term. Measurements at 270 Mc/sec over a temperature range of 30°–60°C have checked this value to an accuracy of 2%. Velocity measurements were also carried out over this range. The accuracy of the measurement and the certainty of the physical constants entering into the classical value are discussed. The measurement was made over an inch of path length, and the attenuation in this distance was approximately 29 dB. As far as is known, this is the lowest value of ultrasonic absorption occurring in liquids. [Work supported in part by the U. S. Office of Naval Research.]
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