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If the ground cools rapidly but the air is very dry why will less dew form?

Answer and explanation

Correct answer: Because dry air does not contain enough water vapour for condensation

Answer: B. Dew forms when air touching or lying close to the ground cools to its dew point, so some water vapour changes into liquid droplets on a cool surface. Rapid ground cooling can favour this process, but there must first be enough water vapour in the nearby air. Very dry air contains little vapour, so there is less material available to condense and the amount of dew is small. A is wrong because a cool surface generally promotes condensation when moisture is present. C is wrong because cooling usually raises relative humidity for a given amount of vapour; it does not always decrease it. D is wrong because dew can form without rainfall. Memory cue: dew needs both a cool surface and nearby moisture.

Related tags

GeographyDew FormationDew PointHumidityCondensationClouds And PrecipitationWater In The AtmosphereClass 12 Mcq

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