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Why is vapour pressure useful in the study of humidity?

Answer and explanation

Correct answer: Because it expresses the partial pressure exerted by water vapour

Direct answer: A is correct. Atmospheric air is a mixture of gases, and each gas contributes part of the total atmospheric pressure. The part contributed by water vapour is called vapour pressure, more precisely the partial pressure of water vapour. It provides a measurable way to describe the actual amount of moisture in air. Saturation vapour pressure is the maximum vapour pressure possible at a particular temperature, while actual vapour pressure tells how much water vapour is present at that time. These values are used to calculate relative humidity and understand evaporation, condensation, and cloud formation. A is correct because it gives the scientific meaning of vapour pressure. B, C, and D are wrong because river speed, sound pitch, and ocean waves are different physical quantities unrelated to vapour pressure. Memory cue: vapour pressure is the pressure contribution made by water vapour, not the pressure of the whole atmosphere.

Related tags

Vapour PressureHumidityPartial PressureWater VapourEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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