Untersuchungen über den frequenzunabhängigen Anteil der Schallabsorption in organischen Flüssigkeiten und in flüssigem Helium

The collision factor theory which has been put forward for explaining the frequency independent part of the sound absorption in liquids is empirically extended by an additional factor, which is a higher power of the ratio of the critical temperature to the temperature of measurement. The discrepancies between the measured absorption values and those calculated previously for some substances are thus reduced considerably. It can consequently be said that the temperature curve of the sound absorption goes through a minimum. This minimum cannot be observed in some cases as it lies either below the melting point or above the boiling point. The application of this extended collision factor theory to liquid Helium leads to an improvement in accounting for the experimental facts.