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fog
Fog is a complex atmospheric phenomenon. It is a visible mass consisting of cloud water droplets or ice crystals suspended in the air at or near the Earth's surface.〔"The international definition of fog consists of a suspended collection of water droplets or ice crystal near the Earth's surface ..." Fog and Boundary Layer Clouds: Fog Visibility and Forecasting. Gultepe, Ismail, ed. Reprint from ''Pure and Applied Geophysics'' Vol 164 (2007) No. 6-7. ISBN 978-3-7643-8418-0. p. 1126; see (Google Books ) Accessed 2010-08-01.〕 Fog can be considered a type of low-lying cloud, and is heavily influenced by nearby bodies of water, topography, wind conditions, and even human activities. In turn, fog has affected many human activities, such as shipping and transport, warfare, and culture.
==Definition==
The term "fog" is typically distinguished from the more generic term "cloud" in that fog is low-lying, and the moisture in the fog is often generated locally (such as from a nearby body of water, like a lake or the ocean, or from nearby moist ground or marshes).〔Use of the term "fog" to mean any cloud that is at or near the Earth's surface can result in ambiguity as when, for example, a stratocumulus cloud covers a mountaintop. An observer on the mountain may say that he or she is in a fog, however, to outside observers a cloud is covering the mountain. "Standard practice for the design and operation of supercooled fog dispersal projects" Thomas, P. (2005) p. 3. ISBN 0-7844-0795-9 See (Google Books. ) Accessed 2010-08-01. Further distinguishing the terms, fog rarely results in rain, while clouds are the common source of rain.〕
By definition, fog reduces visibility to less than , whereas mist causes lesser impairment of visibility.
For aviation purposes in the UK, a visibility of less than but greater than is considered to be mist if the relative humidity is 70% or greater; below 70%, haze is reported.〔annex 3 Seventeenth Edition July 2010〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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