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Which common instrument measures the amount of water vapour in air?

Answer and explanation

Correct answer: Hygrometer

Correct answer: A, hygrometer. Humidity means the presence or amount of water vapour in the air, and a hygrometer is the common instrument used to measure it. Some hygrometers measure relative humidity directly, while related instruments may use temperature differences to estimate moisture; the essential point is that the instrument is designed for atmospheric moisture. B, a barometer, measures atmospheric pressure, which is the force exerted by the air. C, a seismograph, records ground vibrations caused by earthquakes and is unrelated to air moisture. D, a rain gauge, measures the amount of precipitation that falls as rain at a place; it does not measure invisible water vapour in the air. Therefore the name and function match only in A. Memory cue: “hygro” relates to moisture, while “baro” relates to pressure and “pluvio” or rain-gauge terms relate to rainfall.

Related tags

GeographyHygrometerHumidityInstrumentsEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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