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How can it be foggy when it's cold?

In: Meteorology and Weather, Physics [Edit categories]

Answer:

The general answer is that fog is caused by condensation of water in the atmosphere. It's like a cloud, except that the cloud is in contact with the ground. That's what fog is. Air has moisture in it, and the amount varies. Also, the amount of moisture that air can hold varies as a function of temperature. The warmer it is, the more moisture that air can hold. But if it cools off, air can't hold as much.

Fog forms when the temperature drops to the point where the air cannot hold all the moisture in it at that temperature. This at 100% relative humidity, which is called the dew point. Fog begins to form as air, which had previously been warmer and had moisture in it, cools until it reaches the dew point. Then we'll see tiny droplets of water forming in the air close to the ground, which is fog. A link can be found below.

First answer by Quirkyquantummechanic. Last edit by Quirkyquantummechanic. Contributor trust: 3691 [recommend contributor ]. Question popularity: 0 [recommend question].

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Wikipedia: Fog

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