The hydrometer is a device used in the direct evaluation of the specific gravity of a particular liquid. The hydrometer was invented by Antoine Baume, chemistry professor at Ecole de Pharmacie in the year 1768. Baumie invented two hydrometers; one measuring fluid denser than water and the other one for liquids less dense than water. The hydrometer is usually made of a thin glass tube which closed at both ends (Holmes, p.156). One of the ends is distended into a bulb which contains mercury or fine lead shot which enables the device to uprightly float in a fluid. The glass tube has a scale calibrated ...
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