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[edit | edit source]
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[edit | edit source]
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[edit | edit source]
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[edit | edit source]
References[edit | edit source]
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Contributors: Prab R. Tumpati, MD
