Q.

The instrument that measures and records the relative humidity of air is –

A. Hydrometer
B. Hygrometer
C. Lactometer
D. Barometer
Answer» B. Hygrometer
Explanation: A hygrometer is an instrument used for measuring the moisture content in the environment. Humidity measurement instruments usually rely on measurements of some other quantity such as temperature, pressure, mass or a mechanical or electrical change in a substance as moisture is absorbed. By calibration and calculation, these measured quantities can lead to a measurement of humidity.
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