Abstract
Sound-absorption measurements in gaseous He-Ar mixtures have been performed at 293 K in a frequency range extending from the Navier-Stokes regime far into the transition (Burnett) region. The shape of the absorption curve is found to be independent of the composition of the mixture. An apparent relaxation time is introduced. This relaxation time shows a sharp maximum at low Ar concentration, due to the mass mismatch between He and Ar.
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