3 relations: Baumé scale, Hydrometer, Specific gravity.
Baumé scale
The Baumé scale is a pair of hydrometer scales developed by French pharmacist Antoine Baumé in 1768 to measure density of various liquids.
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Hydrometer
Hydrometer from Practical Physics A hydrometer or areometer is an instrument used for measuring the relative density of liquids based on the concept of buoyancy.
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Specific gravity
Specific gravity is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume.
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