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Encyclopedia > Aerosol spray
Aerosol spray can
Aerosol spray can

Aerosol spray is a type of canister that sprays an aerosol when its button is pressed or held down. Image File history File links Download high resolution version (1280x960, 668 KB)Aerosol Spray Can I, PiccoloNamek, took this photograph. ... Image File history File links Download high resolution version (1280x960, 668 KB)Aerosol Spray Can I, PiccoloNamek, took this photograph. ... Particulates, alternatively referred to as particulate matter (PM), aerosols or fine particles, are tiny particles of solid (a smoke) or liquid (an aerosol) suspended in a gas. ...


This type of spray can is a canister containing liquid under pressure from pressurized vapor in equilibrium with another liquid, which often also dissolves the payload (see propellant below). When the can's valve is opened, the liquid is forced out of a small hole and emerges as an aerosol or mist. As gas expands to drive out the payload, some propellant evaporates inside the can to maintain an even pressure. Outside the can, the droplets of propellant evaporate rapidly, leaving the payload suspended as very fine particles or droplets. Typical liquids dispensed in this way are insecticides, deodorants and paints. An atomiser is a similar device that is pressurised by a hand-operated pump rather than by stored gas. Particulates, alternatively referred to as particulate matter (PM), aerosols or fine particles, are tiny particles of solid (a smoke) or liquid (an aerosol) suspended in a gas. ... Dramatic morning mist Mist is a phenomenon of a liquid in small droplets floating through air. ... An insecticide is a pesticide used against insects in all developmental forms. ... Roll-on deodorant Deodorants are cosmetic substances applied to the body, most frequently the armpits, to reduce the body odor caused by the bacterial breakdown of perspiration. ... This article does not cite its references or sources. ... Atomization is common practice to inject the fuel into the combustor (or premixer) through a nozzle, which atomizes the fuel. ...

Contents

History

The concepts of an aerosol goes as far back as 1790 [1]


The modern aerosol spray can was invented in Oslo in 1926 by Erik Rotheim, a Norwegian chemical engineer. [2] The patent was sold to a US company for 100,000 Norwegian kroners. Norway Post celebrated the invention with issuing a stamp in 2000 [3] It wasn't until 1941 that it was first put to good use by Americans Lyle Goodhue and William Sullivan. They turned it into an instrument for the US military to fight the malaria mosquito in the Pacific during World War II. County Oslo NO-03 District Viken Municipality NO-0301 Administrative centre Oslo Mayor (2004) Per Ditlev-Simonsen (H) Official language form Neutral Area  - Total  - Land  - Percentage Ranked 224 454 km² 426 km² 0. ... ISO 4217 Code NOK User(s) Norway Inflation rate 2. ... Malaria is a vector-borne infectious disease that is widespread in tropical and subtropical regions. ... For other meanings of Pacific, see Pacific (disambiguation). ... Combatants Allied powers: China France Great Britain Soviet Union United States and others Axis powers: Germany Italy Japan and others Commanders Chiang Kai-shek Charles de Gaulle Winston Churchill Joseph Stalin Franklin Roosevelt Adolf Hitler Benito Mussolini Hideki Tōjō Casualties Military dead: 17,000,000 Civilian dead: 33,000...


Propellant

If the can was simply filled with compressed gas, either it would need to be at a dangerously high pressure, or the amount of gas in the can would be small, and it would soon run out. Hence, usually, the gas is the vapour of a liquid with boiling point slightly lower than room temperature. This means that inside the pressurised can, the vapour can exist in equilibrium with its bulk liquid at a pressure that is higher than atmospheric pressure (and able to expel the payload), but not dangerously high; yet, as gas escapes it is immediately replaced by more evaporating liquid. Since the propellant exists in liquid form in the can it is desirable that it be miscible with or dissolved in the payload. Vapor (US English) or vapour (British English) is the gaseous state of matter. ... The boiling point of a substance is the temperature at which it can change its state from a liquid to a gas throughout the bulk of the liquid at a given pressure. ... Room temperature describes a certain temperature within enclosed space that is uses for various purposes by human beings. ... In thermodynamics, a thermodynamic system is said to be in thermodynamic equilibrium when it is in thermal equilibrium, mechanical equilibrium, and chemical equilibrium. ... Image:Tagesgang-luftdruck. ...


Chlorofluorocarbons (CFCs) were once often used but since the Montreal Protocol came into force in 1989 they have been replaced, in nearly every country, due to the negative effects CFCs have on Earth's ozone layer. The most common replacements are mixtures of volatile hydrocarbons, typically propane, n-butane and isobutane. Dimethyl ether (DME) and methylethyl ether are also used. All these have the principle disadvantage of being quite flammable. Nitrous oxide is also used as a propellant to deliver foodstuffs (for example, whipped cream and cooking spray). Medicinal aerosols such as asthma inhalers use hydrofluoroalkanes (HFA): either HFA 134a (1,1,1,2,-tetrafluoroethane) or HFA 227 (1,1,1,2,3,3,3-heptafluoropropane) or combinations of the two. For other uses, see CFC (disambiguation). ... The Montreal Protocol on Substances That Deplete the Ozone Layer is an international treaty designed to protect the ozone layer by phasing out the production of a number of substances believed to be responsible for ozone depletion. ... The ozone layer, or ozonosphere layer (very rarely used term), is the part of the Earths atmosphere which contains relatively high concentrations of ozone (O3). ... Hydrocarbons are refined at oil refineries and processed at chemical plants A hydrocarbon is a chemical compound that consists only of the elements carbon (C) and hydrogen (H). ... Propane is a three-carbon alkane, normally a gas, but compressible to a liquid that is transportable. ... Butane, also called n-butane, is the unbranched alkane with four carbon atoms, CH3CH2CH2CH3. ... Butane is an alkane hydrocarbon with the molecular formula C4H10. ... Dimethyl ether, also known as methoxymethane, oxybismethane, methyl ether, wood ether, and DME, is a colorless gaseous ether with an ethereal odor. ... Ether is the general name for a class of chemical compounds which contain an ether group — an oxygen atom connected to two (substituted) alkyl groups. ... R-phrases S-phrases Supplementary data page Structure and properties n, εr, etc. ... Cream is a dairy product that is composed of the higher-fat layer skimmed from the top of raw milk before homogenization. ... Cooking spray is used as a substitute for lard, butter, and other products applied to frying pans and other cookware to prevent food from sticking to it. ...


Packaging

Aerosol spray products have three major parts; the can, the valve and the actuator or button. The can is most commonly lacquered tinplate (steel with a layer of tin) and may be made of 2 or 3 pieces of metal crimped together. Aluminum cans are also common and are generally used for more expensive products. The valve is crimped to the rig of the can, the design of this component is important in determining the spray rate. The actuator is depressed by the user to open the valve; the shape and size of the nozzle in the actuator controls the spread of the aerosol spray. Plating is the general name of surface-covering techniques in which a metal is coated onto a solid surface. ... Aluminum is a soft and lightweight metal with a dull silvery appearance, due to a thin layer of oxidation that forms quickly when it is exposed to air. ...


Uses

References

  • About.com [1]
  • http://www.graffiti.no. [2]. Retrieved January 13, 2007.

See also

Aerosol paint is paint contained in a pressurized aerosol spray can used for spray dispensing. ... Before flue gas desulfurization was installed, the emissions from this power plant in New Mexico contained excessive amounts of sulfur dioxide. ... The haloalkane (also known as halogenoalkanes) are a group of chemical compounds, consisting of alkanes, such as methane or ethane, with one or more halogens linked, such as chlorine or fluorine, making them a type of organic halide. ... Global monthly average total ozone amount The term ozone depletion is used to describe two distinct but related observations: a slow, steady decline of about 3 percent per decade in the total amount of ozone in Earths stratosphere during the past twenty years; and a much larger, but seasonal... R-phrases S-phrases Supplementary data page Structure and properties n, εr, etc. ...

External links


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