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When the difference between dew point and air temperature is very small, which conclusion is most appropriate?

Answer and explanation

Correct answer: The air is close to saturation

The correct answer is B. The dew point is the temperature to which air must be cooled, with pressure conditions broadly unchanged, for it to become saturated. If the air temperature is only slightly higher than its dew point, only a small amount of cooling is needed to reach saturation. This indicates high relative humidity and a small dew-point depression. A is wrong because very dry air usually has a large difference between air temperature and dew point. C is too absolute: evaporation may still occur, depending on the surface and conditions. D is wrong because air near saturation contains substantial water vapour. When the temperature reaches the dew point, condensation such as dew or fog may begin if nuclei and other conditions are suitable. Memory cue: small spread means moist air; large spread means dry air.

Related tags

Dew Point SpreadSaturationHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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