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Credit: Alexandre Dotta/SCIENCE PHOTO LIBRARY

Caption: Various hydrometers. A hydrometer is an instrument used to measure the specific gravity (relative density) of liquids; that is, the ratio of the density of the liquid to the density of water.

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Keywords: chemistry, density, device, educational, equipment, hydrometer, instrument, kinds, measure, measurement, object, relative density, science, specific gravity, still life, types, various

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