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For condensation to begin in the atmosphere, what relative humidity condition is generally required?

Answer and explanation

Correct answer: About 100%, that is, saturation

Correct answer: B, about 100%, or saturation. Relative humidity is 100% when air contains the maximum water vapour it can hold at its current temperature. As moist air cools toward its dew point, its capacity to hold vapour decreases. When saturation is reached, additional cooling or addition of vapour can cause water vapour to condense into tiny liquid droplets, especially on condensation nuclei, producing cloud or fog droplets. A value such as 50% or 75% means the air is not yet saturated under the stated conditions, so condensation is not generally expected solely because of that value. C, zero percent, means essentially no water vapour and cannot support condensation. The wording “generally” is important: in real clouds, particle surfaces and supersaturation can affect the exact onset, but the school-level threshold is saturation near 100%. Memory cue: dew point is the temperature at which air reaches saturation; 100% relative humidity is the basic starting condition for condensation.

Related tags

CondensationRelative HumidityDew PointSaturationHydrological CycleThe Living WorldBiologyClass 11 Mcq

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