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Acoustic behaviour of a liquid/vapour mixture in a standing-wave tube

We study the acoustic behaviour of a mixture of diethyl-ether bubbles and liquid, at small volume fraction of vapour, contained in a standing-wave tube. We give experimental evidence of the effect of the liquid/vapour phase transition on the positions and amplitudes of the resonances of the tube. The effective-medium theory, which properly describes the behaviour of liquid/gas mixtures, is shown to be inadequate. We find that theoretical studies which take the effect of the phase transition into account do agree with our experimental data.