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How is specific humidity defined in science in the context of the water cycle?

Answer and explanation

Correct answer: नम हवा के कुल द्रव्यमान में जलवाष्प का द्रव्यमान (Mass of water vapour per unit mass of moist air)

Correct answer: B. Specific humidity is the mass of water vapour divided by the total mass of moist air, usually expressed as grams of water vapour per kilogram of moist air. The denominator includes both dry air and water vapour, so this quantity describes the actual amount of moisture carried by an air parcel. A is wrong because total air pressure is the force per unit area exerted by the air and is not a measure of water-vapour mass. C is wrong because relative humidity is a percentage comparing the present vapour amount with the saturation amount possible at the same temperature; it is not the same as specific humidity. D is wrong because density is mass per unit volume, whereas specific humidity is a mass ratio. A useful caution is that temperature can change relative humidity strongly even when the actual water-vapour mass changes little. Memory cue: specific humidity asks, ‘How much vapour is in each kilogram of moist air?’

Related tags

Specific HumidityHumidityWater VapourAtmosphereHydrological CycleThe Living WorldBiologyClass 11 Mcq

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