For a round water jet issuing into stationary water, momentum and material diffusion were measured, the latter by means of a sodium chloride tracer technique. It was found that (a) the behavior of the water jet was the same as that found by others for an air jet issuing into air, and hence constants obtained from measurements in air can be applied to water; (b) the turbulent Schmidt number for water is approximately the same as the turbulent Schmidt number for air and about equal to the turbulent Prandtl number for air jets; and (c) the error curve serves as a useful and satisfactory representation of diffusion profiles for water just as it does for air.

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