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What is Difference between Fog,Mist,Dew?

Asked by SWATI, 30 Jan '09 01:06 pm
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Answers (2)


FOG - Fog is a cloud which is in contact with the ground. Much like clouds in the sky, fog forms when the air becomes supersaturated, meaning that it can no longer hold moisture in the form of vapor. As a result, water precipitates out of the air, forming a fine mist of water droplets.

Mist is a phenomenon of small droplets suspended in air. It can occur as part of natural weather or volcanic activity, and is common in cold air above warmer water, in exhaled air in the cold, and in a steam room of a sauna. It can also be created artificially with aerosol canisters if the humidity conditions are right.

The only difference between mist and fog is visibility . This phenomenon is called fog if the visibility is one kilometre (~1,093 yards) or less. Otherwise it is known as mist.

Dew - Dew is water in the form of droplets that appears on thin, exposed objects in the morning or evening. As the exposed surface cools by radiating its heat, atmospheric moisture condenses at a rate grea ...more
Answered by Lakshmi Rajesh, 30 Jan '09 01:09 pm

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When warm air passes gently over colder sea or land surface the air in contact with the colder surface also cools. If the air is cooled below its dew point, the air releases moisture and the water droplets settle on the land surface this is DEW. Some of the water droplets settle on the dust particles, pollutants, salt present in the air. These water droplets remain suspended in the air as they are very small and light. These suspended water droplets form MIST.
MIST: size of water droplets is less than 1 micron, and the visibility is about 1 Km.

When the size of waterdroplets increases to between 1 to 10 microns the mist becomes dense and ,is called as FOG.

FOG: size of water droplets 1 to 10 microns and visibility less than 1 KM.

Mist is always there before and after FOG.

Hope it suffices.
Answered by rajeev pal, 30 Jan '09 01:07 pm

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