Question

define hydrometer please don't spam ​

Answer 1

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A hydrometer is an instrument used for measuring the relative density of liquids based on the concept of buoyancy. They are typically calibrated and graduated with one or more scales such as specific gravity. ... The point at which the surface of the liquid touches the stem of the hydrometer correlates to relative density.

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Answer 2

Hygrometer, instrument used in meteorological science to measure the humidity, or amount of water vapour in the air. Several major types of hygrometers are used to measure humidity.