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Q.

Hydrometer works on the [[1]] principle.


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Detailed Solution

Hydrometer works on the Archimedes principle.
According to this principle, “When an object is immersed fully or partially in a fluid, it experiences a buoyant force or upthrust which is equal to the weight of the fluid displaced by the object”. A hydrometer is used to measure the specific gravity of a liquid. The schematic diagram of a hydrometer is shown in the given picture.
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