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2016-01-12T19:04:29+05:30
This is done so as to lower the center of gravity of the hydrometer so that it remains in a stable equilibrium and floats in an upright position.

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2016-01-12T19:06:12+05:30
the lower bulb of a hydrometer is filled with lead shots or mercury to make the hydrometer float vertically in liquids.
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