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Literally meaning "water measurer," a hydrometer is an instrument comprised of a vertical scale inside a sealed glass tube weighted at one end. It's used to measure the ratio (called specific gravity) of the density of a liquid (such as sulfuric acid) to that of pure water. A hydrometer floats upright in liquid; the reading is taken where the liquid's surface hits the scale-and the hydrometer floats higher in denser liquid.

Commercial hydrometers are usually calibrated for ordinary room temperature, which is taken to be 20C (68F). Because of the variation in the depth to which the instrument sinks in heavy and in light liquids, one type is made for use in liquids more dense than water and another for use in those less dense than water.



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Last Updated: Monday, December 03, 2007 - 6:52 AM Eastern Time.