Ultrasonic Classification of Organic Liquids

Ultrasonic absorption in various organic liquids at four different frequencies 1.00, 1.46, 2.89, and 4.00 Mc as well as their temperature coefficient of absorption (25°C to 60°C) have been studied by ultrasonic interferometer. Liquids have been classified into four broad groups, Class I in which absorption due to changes in the heat content of the medium predominates, Class II in which absorption caused by structural changes in the quasi-crystalline structure of the liquid state predominats, Class III in which viscosity of the medium alone accounts for absorption and Class IV where absorption is not proportional to the square of the frequency.