A fixed path ultrasonic unit operating in the frequency range of 20–200 mcps is described which can be used for measuring acoustic wave velocities and losses in liquids as a function of temperature and hydrostatic pressure. A simple phase balance technique insures a high order of accuracy for velocity determinations, Illustrative data for carbon tetrachloride, Dow Corning DC-703 and DC-200 silicone fluids, and water are shown. Determination of freezing points of liquids using ultrasonic waves for indication is also discussed briefly.
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H. J. McSkimin (1957) studied this question.