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Instrumentation Reference Book, 4th Edition by Walt Boyes

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Chapter 13. Measurement of Density
E.H. Higham and W. Boyes

13.1. General

The measurement and control of liquid density are critical to a large number of industrial processes. But although density in itself can be of interest, it is usually more important as a way of inferring composition or concentration of chemicals in solution, or of solids in suspension. In addition, density is often used as a component in the measurement of mass flow. Because the density of gases is very small, the instruments for that measurement have to be very sensitive to small changes. They are dealt with separately at the end of the chapter.
In considering the measurement and control of density or relative density* of liquids, the units used in the two factors should be ...

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