Abstract
In liquids with a high ultrasonic absorption coefficient as, f.i. benzol, has been observed that an augmentation of the power of the piezoelectric quartz might be a cause of energy dissipation to be ascribed to cavitation and acoustic flow which whould be the origin of the high absorption coefficient. Measures are reported from which it appears that the augmentation of power really produces some uncertainty in the measure ofΔT and therefore of the coefficient α; but, anyway, by a proper proceeding it is possible to obtain for α concordant values with respect to several measurements and one sees therefore that for benzol the thermal method gives a value of the absorption coefficient very greater as the theoretical value.
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