The sound velocity and attenuation of xenon near its critical point have been measured with a pulsed acoustic interferometer which incorporates phase-sensitive detection and signal averaging. Accurate data could be obtained over the frequency range from 0.4 to 7 MHz in spite of the very large attenuation. Results are given in detail along a near-critical isochore and are also reported along several isotherms.
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Mueller et al. (1972) studied this question.
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