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| | | #REDIRECT [[Particle]] |
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| == particles ==
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| <div class="definition"><div class="short_definition">Components of the [[atmosphere]] composed of solid or liquid matter.</div><br/> <div class="paragraph">Particles may be both released from the earth's surface, such as [[dust]] or [[smoke]], or formed in the atmosphere, as in [[rain]] or [[ice]] particles or sulfate [[aerosol]]. The particles in the atmosphere are usually defined in terms of their size, or diameter. Particles less than 100 μm in diameter are referred to as aerosol particles. These are aerodynamically stable and settle out only slowly (strictly speaking, the term aerosol refers to the gas–particle [[colloidal system]], not just the particulate [[phase]]). The aerosol is usually divided into three modes: the Aitken mode (diameter less than 0.5 μm), the [[accumulation mode]] (0.5–2.0 μm), and the coarse mode (greater than 2 μm). The Aitken and accumulation modes are collectively referred to as [[fine particles]]. The larger particles of the coarse mode compose [[clouds]] and [[hydrometeors]] such as rain and [[sleet]], which precipitate out. <br/>''See also'' [[particle]].</div><br/> </div>
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| [[Category:Terms_P]] | |
