The hydrometer is a device used for determining characteristics of a liquid such as its density, or weight per unit volume. it is also used to determine a liquid’s specific gravity.
Principle of Hydrometer
It is work on the principle that a floating body sinks deeper in a light liquid than in a heavy one.(Archimedes' principle)
It consists essentially of a weighted, sealed, long-necked glass bulb that is immersed in the liquid being measured; the depth of flotation gives an indication of liquid density, and the neck can be calibrated to read density, specific gravity, or some other related characteristic.
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