Abstract
AFTER establishing1 the equivalence of sonic and thermal energies (given by the relation I = JH, where I is the intensity of sound at the source, H is the heat produced by absorption of this sound and J the conversion factor which has the same value of 4.19 × 107 ergs/sec. as the mechanical equivalent of heat) this relationship was utilized in this Laboratory to develop a novel technique for the measurement of ultrasonic absorption coefficient in liquids. It consists of the measurement of heat produced at different points along the path of an ultrasonic beam, and its application in the formula H = H 0 exp(− 2αx) where I in the usual formula for attenuation is replaced by H because of the earlier equivalence relation. A series of measurements of absorption coefficient have been taken with this technique and the results have already been reported2 elsewhere along with full experimental details. These results have shown that the accuracy of this method is high and the values of absorption coefficient so obtained are in close agreement with those obtained by other methods of measurement.
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