Fog

Fog is a complex atmospheric phenomenon. It is a visible aerosol consisting of tiny water droplets or ice crystals suspended in the air at or near the Earth's surface. Fog can be considered a type of low-lying cloud and is heavily influenced by nearby bodies of water, topography, and wind conditions.

Overview

Fog forms when the difference between air temperature and dew point is less than 2.5 °C or 4 °F. Fog begins to form when water vapor condenses into tiny liquid water droplets that are suspended in the air.

Types of Fog

There are several types of fog, each with its own unique characteristics and formation processes. These include:

• Radiation fog which is formed by the cooling of land after sunset by thermal radiation in calm conditions with clear sky.
• Advection fog which occurs when moist air passes over a cool surface by advection (wind) and is cooled.
• Evaporation fog which is caused by cold air passing over warmer water or moist land.
• Freezing fog which is any kind of fog where the droplets freeze into very tiny crystals of ice in midair.

Health Effects

While fog itself is not harmful, it can significantly reduce visibility, making driving conditions dangerous. It can also exacerbate respiratory conditions in some individuals.

See Also

• Cloud
• Weather
• Meteorology

References

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