What is fog? Detailed answer

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What is fog? Detailed answer

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What is fog?

Fog is a cloud near the surface of the earth. There is no difference between fog and cloud in the sky. When a cloud is near the surface of the earth or sea, we call it "fog".

Usually fog forms at night and early in the morning in lowlands and above water bodies. It is associated with a cold stream of air that descends on warm surfaces of land or water.

Fogs are more often in the fall when air cools faster than land or water. In calm weather with the onset of dark in thin places above the ground, thin layers of fog are formed. As the earth cools down at night, the lower layers of air become colder. When such cool air comes into contact with warm air, fog forms.

As a rule, urban fogs are thicker than rural. The urban air is full of dust and soot, which, when combined with particles of water, form a dense blanket.

The foggiest region of the Earth is the Atlantic coast of Newfoundland (Canada), where fogs are formed when humid warm air passes over cold waters that move south from the Arctic Circle. The coldness of the water condenses the moisture in the air into small droplets of water. These droplets are not large enough to form rain. They are in the air in the form of fog.

And fogs in the San Francisco area are formed completely differently. Here, the cool morning breeze blows toward the warm sand dunes, and if rain has soaked the sand the day before, a dense layer of mist from evaporating moisture is formed.

Often fog appears denser than clouds. This is because the mist droplets are smaller in size.

Many tiny droplets absorb more light than large droplets (but fewer) that form a cloud. So it seems to us that fogs are thicker than clouds.

Author: Likum A.

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