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International audienceWe measured the dispersion relation for acoustic longitudinal waves in liquid foams, over a broadfrequency range (60–600 kHz). Strong dispersion was found, with two nondispersive behaviors, separatedby a negative density regime. A new model, based on the coupled displacements of films, liquid channels,and gas in the foam, rationalizes all the experimental findings

Resonant Acoustic Propagation and Negative Density in Liquid Foams