SOUND-VELOCITY DISPERSION IN A SOLUTION WITH 2 CRITICAL-POINTS

The dispersion of the sound velocity in a solution with a region of st ratification has been investigated experimentally in the frequency ran ge from 2.6 MHz to 12 GHz. It is found that the dispersion of the soun d velocity below the lower critical temperature of stratification reac hes 22% and depends linearly to the temperature above the upper critic al temperature of separation, the dispersion of the sound velocity is much smaller and has a different linear dependence on the temperature. (C) 1996 American Institute of Physics.