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If the dew point is very low, what can be concluded about the air?

Answer and explanation

Correct answer: The air contains little water vapour

Correct answer: A. Dew point is the temperature to which air must be cooled, at nearly constant pressure and moisture content, for saturation to begin. A very low dew point generally means that the air contains little actual water vapour; it would have to cool considerably before reaching saturation. A is correct because dew point is a useful indicator of the air’s absolute moisture content. B is wrong because air at a low dew point is not necessarily saturated at its present temperature. C is wrong because clouds are not required for a low dew point. D is wrong because evaporation can occur in dry air, and dry air often permits faster evaporation when other conditions are suitable. Memory cue: low dew point means little moisture, not necessarily low temperature alone.

Related tags

Low Dew PointActual HumidityDry AirHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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