Ultrasonic absorption measurements have been made in liquid methylene chloride between 7.5 and 210 Mc/s. These confirm recent work in the vapour by Sette, Busala and Hubbard (1955), from which it was concluded that the relaxation of the vibrational specific heat takes place in two parts. In the frequency range studied here there is a single relaxation of specific heat equal in magnitude to the vibrational specific heat less the contribution of the lowest frequency mode of vibration. The relaxation frequency is 170 Mc/s at 25°C.
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J H Andreae (1957) studied this question.
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