Fog
Fog
Fog (/fɒɡ/; from the Old Norse fok, meaning "spray") is a visible aerosol consisting of tiny water droplets or ice crystals suspended in the air at or near the Earth's surface.
Etymology
The term "fog" is derived from the Old Norse fok, which means "spray". This term was likely used to describe the appearance of fog, which resembles a spray of water droplets in the air.
Description
Fog is formed when the difference between temperature and dew point is generally less than 2.5 °C or 4 °F. It can be considered a type of low-lying cloud and is heavily influenced by nearby bodies of water, topography, and wind conditions.
Types of Fog
There are several types of fog, each with its own specific properties and formation processes. These include:
- Radiation fog: This type of fog is formed by the cooling of land after sunset by thermal radiation in calm conditions with a clear sky.
- Advection fog: This fog occurs when moist air passes over a cool surface by advection (wind) and is cooled.
- Evaporation fog: This is caused by cold air passing over warmer water or moist land.
- Freezing fog: This is any kind of fog where the droplets freeze into very tiny crystals of ice in midair.
Related Terms
- Mist: Mist is a phenomenon similar to fog, but the visibility is greater.
- Haze: Haze is traditionally an atmospheric phenomenon where dust, smoke, and other dry particles obscure the clarity of the sky.
- Smog: Smog is a type of air pollution that reduces visibility.
- Dew point: The dew point is the temperature to which air must be cooled to become saturated with water vapor.
See Also
External links
- Medical encyclopedia article on Fog
- Wikipedia's article - Fog
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