Sound Propagation in the Critical‐Temperature Region of Hydrogen Chloride

Abstract

The velocity and absorption of ultrasonic waves have been measured in the critical temperature region of hydrogen chloride at frequencies between 1 and 9 Mc. To explain the f² frequency dependence of the absorption on the basis of scattering by molecular ``clusters,'' one must assume that there is a correlation in the fluctuations in density between adjacent volumes of the fluid.