What does hydrometer consists of?

cylindrical stem and bulb weighted with mercury

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cylindrical stem and bulb weighted with water

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Only cylindrical stem

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only bulb weighted with mercury

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Solution

The correct option is A cylindrical stem and bulb weighted with mercury
A hydrometer is usually made of glass, and consists of a cylindrical stem and a bulb weighted with mercury to make it float upright. The liquid to test is poured into a tall container and the hydrometer is gently lowered into the liquid until it floats freely. The point at which the surface of the liquid touches the stem of the hydrometer correlates to specific gravity. Hydrometers usually contain a scale inside the stem, so that the person using it can read specific gravity.

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