Abstract
The note describes a technique for measuring the density, or more precisely, the density difference between two fluids of nearly equal density. The technique makes use of a lock exchange experiment in which the two fluids are placed on either side of a dividing gate in an elongate tank. Removal of the gate causes an exchange flow to develop and the speed of the advancing dense front is related to the difference in relative density of the two fluids and the depth of fluid in the tank. Measurement of the speed of the intrusion permits the difference in relative density to be determined. The technique has been successfully employed to measure differences in relative density between 4×10-4 and 6×10-2 to an accuracy of ±5 percent of the difference.
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