NationMaster - Encyclopedia: Aerosol can

An aerosol is a collection of particles suspended in a gas. The term refers collectively to both the particles and the gas in which the particles are suspended. The particle size ranges from 0.002 µm to more than 100 µm, that is from a gathering of a few molecules to the size where the particles no longer can be carried by the gas. Download high resolution version (1100x1450, 311 KB)Aerosol pollution over Northern India and Bangladesh File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Download high resolution version (1100x1450, 311 KB)Aerosol pollution over Northern India and Bangladesh File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... A colloid or colloidal dispersion, is a form of matter intermediate between a true solution and a mixture (suspension). ... Gas (actually as, part of the Gnu Binutils package) is the default Gcc Back-end. ... A micrometer is a widely used device in mechanical engineering for precisely measuring thickness of blocks, outer and inner diameters of shafts and depths of slots. ...

Atmospheric aerosols

Some aerosols occur naturally, originating from volcanoes, dust storms, forest and grassland fires, living vegetation, and sea spray. Human activities, such as the burning of fossil fuels and the alteration of natural surface cover, also generate aerosols. Averaged over the globe, anthropogenic aerosols—those made by human activities—currently account for about 10 percent of the total amount of aerosols in our atmosphere. Mauna Loa Observatory atmospheric transmission. ... Mauna Loa Observatory atmospheric transmission. ... This article is about volcanoes in geology. ... Satellite photo of a Saharan dust cloud (2000) over the Eastern Atlantic Ocean. ... Fire in San Bernardino, California Mountains (image taken from the International Space Station) A wildfire, also known as a forest fire, vegetation fire, grass fire, or bushfire (in Australasia), is an uncontrolled fire in wildland often caused by lightning; other common causes are human carelessness and arson. ... An Inner Mongolia Grassland. ... Fossil fuels are hydrocarbon-containing natural resources such as coal, petroleum and natural gas. ...

Radiative forcing from aerosols

Aerosols, natural and anthropogenic, can affect the climate by changing the way radiation is transmitted through the atmosphere. Direct observations of the effects of aerosols are quite limited so any attempt to estimate their global effect necessarily involves the use of computer models. The Intergovernmental Panel on Climate Change, IPCC, says: While the radiative forcing due to greenhouse gases may be determined to a reasonably high degree of accuracy... the uncertainties relating to aerosol radiative forcings remain large, and rely to a large extent on the estimates from global modelling studies that are difficult to verify at the present time [1] (http://www.grida.no/climate/ipcc_tar/wg1/237.htm#678). Electromagnetic radiation or EM radiation is a combination (cross product) of oscillating electric and magnetic fields perpendicular to each other, moving through space as a wave, effectively transporting energy and momentum. ... The Intergovernmental Panel on Climate Change (IPCC) was established in 1988 by two United Nations organizations, the World Meteorological Organization (WMO) and the United Nations Environment Programme (UNEP) to assess the risk of human-induced climate change. The Panel is open to all members of the WMO and UNEP. Its...

A graphic showing the contributions (at 2000, relative to pre-industrial) and uncertainties of various forcing is available here (http://www.grida.no/climate/ipcc_tar/vol4/english/wg1figspm-3.htm).

Sulphate aerosol

Sulphate aerosol has two main effects, direct and indirect. The direct effect, via albedo, is to cool the planet: the IPCC's best estimate of the radiative forcing is -0.4 Watts/m² with a range of -0.2 to -0.8 W/m² [2] (http://www.grida.no/climate/ipcc_tar/wg1/232.htm) but there are substantial uncertainties. The effect varies strongly geographically, with most cooling believed to be at and downwind of major industrial centres. Modern climate models attempting to deal with the attribution of recent climate change need to include sulphate forcing, which appears to account (at least partly) for the slight drop in global temperature in the middle of the 20th century. The indirect effect (via the aerosol acting as cloud condensation nuclei, CCN, and thereby modifying the cloud properties) is more uncertain but is believed to be a cooling. This article discusses the physical or planetological property of albedo. ... The Intergovernmental Panel on Climate Change (IPCC) was established in 1988 by two United Nations organizations, the World Meteorological Organization (WMO) and the United Nations Environment Programme (UNEP) to assess the risk of human-induced climate change. The Panel is open to all members of the WMO and UNEP. Its... The generalised concept of radiative forcing in climate science is any change in the radiation (heat) entering the climate system or changes in radiatively active gases. ... The watt (symbol: W) is the SI derived unit for power. ... Climate models use quantitative methods to simulate the interactions of the atmosphere, oceans, land surface, and ice. ... Attribution of recent climate change attempts to discover what mechanisms are responsible for the observed changes in climate. ... Aerosol pollution over Northern India and Bangladesh - NASA Cloud condensation nuclei or CCNs are small particles (typically 0. ...

Black carbon

Black carbon, soot, from fossil fuels is estimated by the IPCC in the Third Assessment Report of the IPCC, TAR, to contribute a global mean radiative forcing of +0.2 W/m² (was +0.1 W/m² in the Second Assessment Report of the IPCC, SAR), with a range +0.1 to +0.4 W/m². Soot, also called lampblack or carbon black, is a dark powdery deposit of unburned fuel residues, usually composed mainly of amorphous carbon, that accumulates in chimneys, automobile mufflers and other surfaces exposed to smoke—especially from the combustion of carbon-rich organic fuels in the lack of sufficient oxygen. ...

Aerosol spray

Colloquially, an aerosol (short for aerosol spray) is a canister holding a liquid under pressure from a compressed gas (the propellant). When a valve is opened, the liquid is forced out of a small hole and emerges as a mist. Typical liquids dispensed in this way are deodorants and paints. An atomiser is a similar device that is pressurised by a hand-operated pump rather than by stored gas. A propellant is a material that is used to move an object by applying a motive force. ... Misty Hill Mist rising from a hill Mist is a phenomenon of a liquid in small droplets floating through air. ... Deodorants are cosmetic substances applied to the body, most frequently the armpits, to reduce the odor of perspiration. ... For information on the U.S. borough, see Paint, Pennsylvania. ... Atomization is common practice to inject the fuel into the combustor (or premixer) through a nozzle, which atomizes the fuel. ...

The modern aerosol spray can was invented in 1926 by Erik Rotheim, a Norwegian engineer. Yet only in 1941 the Americans Lyle Goodhue and William Sullivan turned it into a useful device, used by military to spray the malaria mosquito during World War II. 1926 was a common year starting on Friday (link will take you to calendar). ... 1941 was a common year starting on Wednesday (link will take you to calendar). ... Malaria - Wikipedia /**/ @import /skins/monobook/IE50Fixes. ...

References

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