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Relative Density or Specific Gravity

The measurement of relative density or specific gravity can be used to confirm that the correct fluid is in use by comparison of the result against product specification. The sample is injected into an oscillating tube, the change in its oscillation is directly proportional to the density of the fluid.  The determination can be carried out using a Digital Density Meter, and can also be used to calculate concentrations of one fluid in another (if the densities of both fluids are known).