On the Origin of the Ultrasonic Absorption in Liquids. III

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Abstract
In “Kneser” liquids the mechanism of excess ultrasonic absorption is the slow exchange of energy between internal and external degrees of freedom, just as in gases. Eight such liquids are selected; in two the relaxation time in the liquid is known from measurements, in the others it is calculated from low-frequency absorption. In comparing the relaxation time for the liquids with that in the vapors of the same substances, the latter is found to be 100 to 600 times that in the liquid. This is related to the ratio of the collision times.

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