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What is the most basic condition for condensation?

Answer and explanation

Correct answer: Air cooling to the dew point

Answer: B, air cooling to the dew point. Condensation is the change of water vapour into liquid water droplets or, in suitable conditions, ice particles. For this change to begin, air generally must become saturated. Cooling moist air reduces its capacity to hold water vapour; when the temperature reaches the dew point, the air is saturated with respect to the vapour present. Further cooling or another suitable change can make excess vapour condense around surfaces or condensation nuclei. B is correct because reaching the dew point describes the essential threshold leading to saturation and condensation. A is wrong because unsaturated air can still accept more vapour and is not at the basic condensation threshold. C is wrong because strong sunshine usually promotes heating and evaporation rather than condensation, although local conditions can be complex. D is wrong because dry air contains too little moisture for ordinary condensation. Remember that the dew point is the key temperature, not simply any low temperature: air must contain moisture and reach saturation. Memory cue: cool moist air to its dew point, and condensation can start.

Related tags

GeographyCondensationDew PointSaturationHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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