Abstract
Measurements of the velocity and attenuation of plane sound waves in a number of organic liquids at pressures up to 10 000 lb/in.2 have been made. From the velocity, the adiabatic compressibility is derived and from this, by comparison with the measured isothermal compressibility, the ratio of specific heats as a function of pressure is calculated. By introducing the measured attenuation into the Kirchhoff formula an ‘ultrasonic’ viscosity as a function of pressure is also derived.

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