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If air dew point is 12°C and present temperature is 12°C what will be the air condition?

Answer and explanation

Correct answer: Saturated

Correct answer: A, saturated. Dew point is the temperature to which air must be cooled, at approximately constant moisture content, for it to become saturated. If the present air temperature is already equal to the dew-point temperature, the air has reached that saturation condition. The relative humidity is therefore approximately 100%, although the question asks for the condition rather than a numerical value. Further cooling can cause condensation, producing dew on suitable surfaces or other forms of condensation depending on the situation. B and C are incorrect because saturated air contains a high amount of water vapour relative to its capacity; it is not dry and does not lack vapour. D is incorrect because 12°C by itself does not describe extremely hot air, and temperature relative to the dew point is the important clue. The equality of air temperature and dew point indicates a very small vapour-pressure deficit. Memory cue: air temperature equals dew point means saturation is reached.

Related tags

GeographyDew PointSaturationRelative HumidityHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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