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A dry and wet bulb instrument is used for what purpose?

Answer and explanation

Correct answer: To determine humidity

Correct answer: A, to determine humidity. A dry-and-wet-bulb instrument is called a psychrometer. The dry bulb measures the ordinary air temperature. The wet bulb is covered with a moist wick, and evaporation from the wick cools it. The amount of cooling depends on how much moisture the surrounding air can still accept. In dry air, evaporation is greater, so the wet-bulb temperature becomes much lower than the dry-bulb temperature. In moist air, evaporation is smaller, so the two readings are closer. The temperature difference is used with tables or a formula to estimate relative humidity. Option A is correct because the instrument measures this humidity-related difference. Option B is wrong because earthquakes are measured with seismographs. Option C is wrong because sea waves require wave-measuring instruments. Option D is wrong because rock age is determined by geological dating methods. Memory cue: dry–wet difference tells us about air moisture.

Related tags

GeographyPsychrometerHumidityRelative HumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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