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What is the correct meaning of dew-point temperature?

Answer and explanation

Correct answer: The temperature at which air becomes saturated and condensation begins

Answer: A, the temperature at which air becomes saturated and condensation can begin. Imagine a parcel of air containing a fixed amount of water vapour being cooled. As its temperature falls, its capacity to hold vapour decreases. The temperature at which it just becomes saturated is called the dew point. If it cools further, excess vapour may condense into dew on a surface, fog near the ground, or cloud droplets higher in the atmosphere, provided suitable surfaces or condensation nuclei are available. A is correct because it gives the central definition. B is wrong because dew point is not the freezing point of an ocean; it concerns moisture saturation in air. C is wrong because wind can continue at the dew point. D is wrong because dew point does not mark the end of rainfall. Dew point can be reached by cooling air, and a high dew point generally indicates more moisture in the air, though the question only asks for the definition. Memory cue: dew point is the cooling point where air becomes full of vapour.

Related tags

GeographyDew PointCondensationSaturationHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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