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What is the correct scientific way to define relative humidity in meteorology?

Answer and explanation

Correct answer: The ratio of actual vapour pressure to saturation vapour pressure at the same temperature

Correct answer: B. Relative humidity compares the water vapour actually present in air with the greatest amount of vapour that air could hold at the same temperature. It is commonly expressed as a percentage: relative humidity = actual vapour pressure ÷ saturation vapour pressure × 100. Temperature must be kept in the comparison because warm air can hold more water vapour than cold air. A is not correct because total water mass alone does not provide a comparison with capacity. C measures overall air pressure, not moisture content. D describes the composition of two major gases, not humidity. At 100% relative humidity, air is saturated, although rain does not automatically occur everywhere. Memory cue: relative means “present compared with possible.”

Related tags

Relative-HumidityWater-VapourMeteorologyHydrological CycleThe Living WorldBiologyClass 11 Mcq

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