Abstract
Interest in acquiring more definite knowledge of the mechanism of sound absorption in electrolytic solutions led to this experimental investigation of the pressure dependence of this phenomenon. A technique was evolved to measure sound absorption in liquids as a function of pressure at frequencies of 100–600 kc. The following properties of a 0.5-molar solution of MgSO4 were measured up to 20 000 psi at 26°C: absorption, relaxation frequency and velocity. The absorption at 20 000 psi is less than one quarter that at atmospheric pressure and the relaxation frequency remains constant at 1.2×106 rad/sec over this pressure interval within the estimated experimental error of ±10%. The velocity increases linearly with pressure at the rate 0.1588 m/atmos. From these data the chemical and adiabatic compressibilities are computed. In an effort to secure quantitative agreement with experimental results some new aspects of the dissociation theory are discussed.
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