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What change occurs in the air near the surface before dew forms?

Answer and explanation

Correct answer: It cools and approaches saturation

Correct answer: A. Dew usually forms when the ground and objects near it lose heat, especially during a clear, calm night. The air touching or immediately above the cool surface also loses heat. As its temperature falls toward the dew point, the air becomes saturated, and some water vapour condenses as liquid drops on grass, leaves or other surfaces. A is correct because it describes the essential change before dew appears. B is wrong because dry air has less moisture available for dew. C is wrong because normal cooling does not change air into oxygen. D is wrong because strong heating generally lowers relative humidity and discourages dew formation. Memory cue: cool surface plus moist air reaching the dew point produces dew.

Related tags

DewSurface AirSaturationDew PointForms Of Condensation: DewFrostFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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