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At night a clear sky cools the ground rapidly why does this increase the chance of dew formation?

Answer and explanation

Correct answer: Ground temperature may reach near dew point

Dew is formed when water vapour in the air changes into tiny liquid droplets on a sufficiently cool surface. A clear night usually allows the ground to lose heat by radiation more efficiently because clouds do not absorb and return as much outgoing heat. The surface can therefore become much colder than the nearby air. If its temperature falls to, or close to, the dew point, the air next to it reaches saturation and condensation can produce dew.

The correct answer is option D because rapid cooling may bring the ground temperature near the dew point. The other choices do not explain dew formation: increasing pressure does not by itself create vapour, solar heating is absent or weak at night, and rain does not have to begin. The important sequence is clear sky, strong radiational cooling, temperature approaching the dew point, and condensation on the surface.

Related tags

GeographyDewRadiational Cooling

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