hydrometer
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Hare's apparatus is used to compare the density of two liquids. When air is removed from the top of the apparatus, the liquids rise in the tubes to heights which are inversely proportional to their densities.
Instrument used to measure the relative density of liquids (the density compared with that of water). A hydrometer consists of a thin glass tube, weighted so that it floats upright, sinking deeper into less dense liquids than into denser liquids. Hydrometers are used in brewing and to test the strength of acid in car batteries.
The hydrometer is based on Archimedes' principle.
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