Question

define fog,dew and frost

Answer 1

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When a warm moist air blows over a cold surface usually snow or ice, or over a cold ocean surface, it causes fog.

When the water vapour in the air cools down, it condenses to firm dew drops on the grades.

Frost consists of ice crystals which are deposited on cool surfaces when temperatures are below freezing point in calm atmospheric conditions.

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Answer 2

Dew: the water droplets formed by condensation of water vapor on a relatively cold surface of an object. It forms when the temperature of an object drops below the dew point temperature.

Frost: the ice crystals formed by deposition of water vapor on a relatively cold surface of an object. It forms when the temperature of an object drops below the frost point temperature.




Fog: a suspended tiny water droplets or ice crystals in an air layer next to the Earth's surface that reduces the visibility to 1000 m (3250 ft.) or lower. For aviation purposes, the criterion for fog is 10 km (6.2 mi.) or less. If the visibility is higher than those limits, the suspension is called mist.
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