Abstract
When a tank of water is heated from below, the turbulent mixing of warmer, more buoyant water produces thermal inhomogeneities and related variations in the index of refraction. The acoustic fluctuations are determined experimentally as a function of the microstructure parameters. The significant parameters of the microstructure are separately measured with thermistors; provision is made to determine the temperature fluctuations at a single point or the correlation of the fluctuations at two points. The relations between the acoustic and the microstructure fluctuations are then determined, and compared with the theory of Mintzer. There is the interesting possibility of determining the parameters of the temperature microstructure by means of acoustic waves. (Supported by the Office of Naval Research.)
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