Ultrasonic Velocity and Absorption in Dry Carbon Dioxide at Moderate Pressures, II

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Abstract
Further measurements have been made with a recording acoustic interferometer [J. Acoust. Soc. Am. 29, 181(A) (1957)] of the velocity and absorption of 1 and 3 mc/sec ultrasound at temperatures from 19° to 51°C—i.e., including the region of the critical point—and at pressures up to 500 atmospheres. The relaxation time τ remains inversely proportional to the density of the gas or liquid in both phases and shifts with temperature in the expected manner. Unlike the velocity, the measured absorption coefficient per wavelength acts as though it were continuous across the density gap between liquid and vapor phases. Practically all the absorption in the region of the experiment is a consequence of thermal relaxation of the vibrational modes of the molecule. (Work supported by the Office of Naval Research.)

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