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If the dew point of a place is far below the current temperature, what does it indicate?

Answer and explanation

Correct answer: Air is relatively dry

The correct answer is C: the air is relatively dry. The dew point is the temperature to which air must be cooled, at nearly constant pressure and water vapour content, for saturation to begin. Compare the actual air temperature with the dew point. A large difference is called a large dew-point depression. It means the air must cool considerably before it becomes saturated, so its present moisture content is relatively low. A is wrong because air near saturation has a dew point close to its current temperature. B is wrong because a low dew point by itself does not make fog certain; fog also requires suitable cooling and local conditions. D is wrong because the dew point does not guarantee immediate rainfall. Memory cue: small temperature–dew-point gap means moist air; a large gap means drier air.

Related tags

GeographyDew PointHumidityDry AirEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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