Aerosol


Aerosol

Technically, an aerosol is a suspension of fine solid particles or liquid droplets in a gas. Examples are smoke, oceanic haze, air pollution, and smog. In general conversation, aerosol usually refers to an aerosol spray can or the output of such a can. The word aerosol derives from the fact that matter "floating" in air is a suspension (a mixture in which solid or liquid or combined solid-liquid particles are suspended in a fluid). To differentiate suspensions from true solutions, the term sol evolved—originally meant to cover dispersions of tiny (sub-microscopic) particles in a liquid. With studies of dispersions in air, the term aerosol evolved and now embraces both liquid droplets, solid particles, and combinations of these. An aerosol may come from sources as various as a volcano or an aerosol can.

Workplace exposure

Concentrated aerosols from substances such as silica, asbestos, and diesel particulate matter are sometimes found in the workplace and have been shown to result in a number of diseases including silicosis and black lung. [cite web
last =
first =
authorlink =
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title = Aerosols
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publisher = United States National Institute for Occupational Safety and Health
date =
url = http://www.cdc.gov/niosh/topics/aerosols/default.html
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doi =
accessdate = 2008-03-15
] Respirators can protect workers from harmful aerosol exposure. In the United States the National Institute for Occupational Safety and Health certifies respirators through the National Personal Protective Technology Laboratory to ensure that they protect workers and the public from harmful airborne contaminants. [cite web
last =
first =
authorlink =
coauthors =
title = Respirators
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publisher = United States National Institute for Occupational Safety and Health
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url = http://www.cdc.gov/niosh/npptl/topics/respirators/
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accessdate = 2008-03-15
]

Effect on climate

Anthropogenic aerosols, particularly sulfate aerosols from fossil fuel combustion, exert a cooling influence on the climate. [" [http://www.grida.no/climate/ipcc_tar/wg1/figspm-3.htm Climate Change 2001] "United Nations Environmental Program Intergovernmental Panel on Climate Change] The cooling effect of aerosols, however, does not seem to directly counteract the warming induced by greenhouse gases such as carbon dioxide, methane and water vapor and is accounted for in climate models, despite some claims that "global dimming" by aerosols may counteract global warming. [Citation
last = Romanou
first = Anastasia
author-link =
last2 = others
first2 =
author2-link =
title = 20th century changes in surface solar irradiance in simulations and observations
journal = Geophysical Research Letters
volume = 34
issue =
pages = L05713
date =
year = 2007
url = http://pubs.giss.nasa.gov/docs/2007/2007_Romanou_etal.pdf
doi = 10.1029/2006GL028356
id =
]

Recent studies of the Sahel drought [ [http://apollo.eas.gatech.edu/EAS6792/presentations/aerosol_effects.ppt Pollutants and Their Effect on the Water and Radiation Budgets] ] and major increases since 1967 in rainfall over the Northern Territory, Kimberley, Pilbara and around the Nullarbor Plain have led some scientists to conclude that the aerosol haze over South and East Asia has been steadily shifting tropical rainfall in both hemispheres southward [ [http://www.csiro.au/files/files/pbg2.pdf Australian rainfall and Asian aerosols] ] . The latest studies of severe rainfall declines over southern Australia since 1997 [ [http://www.theage.com.au/news/national/pollution-rearranging-ocean-currents/2008/01/21/1200764169893.html Pollution rearranging ocean currents] ] have led climatologists there to consider the possibility that these Asian aerosols have shifted not only tropical but also midlatitude systems southward.

References

ee also

* Aerosol spray, the spraying device
* Bioaerosol
* Particulate, mixed-phase state of matter
* Pollution

External links

* [http://www.aaar.org American Association for Aerosol Research]


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Look at other dictionaries:

  • aérosol — [ aerɔsɔl ] n. m. • 1928; de aéro et 4. sol 1 ♦ Phys. Suspension dans un milieu gazeux (l air ou tout autre gaz) de particules colloïdales solides ou liquides. Le brouillard, les nuages sont des aérosols. 2 ♦ Cour. Système ou appareil qui… …   Encyclopédie Universelle

  • Aerosol — Aérosol Transports de poussières/aérosols jusqu au Canaries à partir du Sahara (Image Terra/MODIS 17.02.2004) …   Wikipédia en Français

  • aerosol — AEROSÓL, aerosoli, s.m. (Mai ales la pl.) Sistem prin care se realizează împrăştierea mecanică în aer1 sau într un gaz a unor particule solide sau lichide şi care este folosit în medicină în tratamentul unor boli, în agricultură la combaterea… …   Dicționar Român

  • aerosol — m. fís. Suspensión de partículas sólidas o líquidas muy finas en un gas. ⊆ instrum. Recipiente estanco a presión que permite descargar su contenido, ya sea líquido o un sólido disuelto en un líquido; el resultado es la emisión de un aerosol… …   Diccionario médico

  • aerosol — (Del fr. aérosol). 1. m. Suspensión de partículas ultramicroscópicas de sólidos o líquidos en el aire u otro gas. 2. Sistema coloidal obtenido por dispersión de sustancias sólidas o líquidas en el seno de un gas. 3. Líquido que, almacenado bajo… …   Diccionario de la lengua española

  • Aerosol — (m) eng aerosol, spray …   Arbeitssicherheit und Gesundheitsschutz Glossar

  • aerosol — sustantivo masculino 1. (no contable) Suspensión en un gas de pequeñas partículas de un líquido o de un sólido. 2. Líquido almacenado a presión en un envase que puede lanzarse al exterior pulverizado: Me gusta más usar esta medicina en aerosol. 3 …   Diccionario Salamanca de la Lengua Española

  • aerosol — [er′ə säl΄, er′əsôl΄] n. [ AERO + SOL3] a suspension of colloidal particles in a gas adj. 1. designating or of a small container in which gas under pressure is used to aerate and dispense a liquid spray through a valve 2. dispensed by such a… …   English World dictionary

  • aerosol — ‘Envase que contiene un gas a presión, mezclado con un líquido, que permite expulsar este pulverizado’: «Cargaron sus bolsos con aerosoles y se largaron a garabatear las paredes de Buenos Aires» (Ramos/Lejbowicz Corazones [Arg. 1991]). Con este… …   Diccionario panhispánico de dudas

  • aerosol — 1923, from AERO (Cf. aero ) air + first syllable in SOLUTION (Cf. solution). A term in physics; modern commercial application is from 1940s …   Etymology dictionary

  • aerosol — ȁerosōl m DEFINICIJA 1. ukupnost koloidno raspršenih čestica tekućih ili krutih tvari u zraku (npr. magla, dim i sl.) 2. sredstvo za dezinfekciju, pročišćavanje i osvježavanje zraka ETIMOLOGIJA aero + nlat. (hydro)sol: koloidna otopina …   Hrvatski jezični portal


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