misspelledsearch.com:flame retardant clothinginformation page
If you cannot find the information you are searching for on this page, we suggest searching Google with the correct spelling "flame retardant clothing":
To meet Wikipedia's quality standards, this article or section may require cleanup. See rationale on the talk page, or replace this tag with a more specific message. Editing help is available. This article has been tagged since November 2005. Flame generated by the burning of a candle.
Flame is a plasma, an ionised gaseous product of fire, derived from combustion, an exothermic self-sustaining oxidation reaction. In layman's terms, it is the visible part of a fire. The most common gaseous products of combustion are carbon dioxide and water vapour. A flame consists of the reacting gases emitting heat and light and is dependent on the chemical species involved in the combustion. The light is produced by particles of incomplete combustion (soot) rising through convection and giving off blackbody radiation. In many cases, such as the burning of organic matter like wood or incomplete combustion of gasoline, this produces the familiar red-orange colour. This light has a continuous spectrum. Complete combustion of gas (which produces no black bodies) has a dim blue color due to the emission of single wavelength radiation from various electron transitions in the excited molecules formed in the flame. Usually oxygen is involved, but hydrogen burning in chlorine produces a flame as well, producing hydrogen chloride (HCl). Other possible combinations producing flames, among many, are fluorine and hydrogen or hydrazine and nitrogen tetroxide. There are different methods of distributing the required components of combustion to a flame. In a diffusion flame, oxygen and fuel diffuse into each other; where they meet the flame occurs. In a premixed flame, the oxygen and fuel are premixed beforehand, which results in a different type of flame. Candle flames operate through evaporation of the fuel. Flame colors(disputed — see talk page) Different flame types of a Bunsen Burner depending on oxygen supply In zero gravity, convection does not carry the hot combustion products away from the fuel source, resulting in a spherical flame front.Flame color depends on three components, blackbody radiation, spectral line emission and to a lesser degree spectral line absorption. Depending on oxygen supply, which determines the rate of combustion, temperature and reaction paths, different color hues can be observed in flames. Recent discoveries by the National Aeronautics and Space Administration (NASA) of the United States also has found that gravity plays a role. [1] Pictured on the right is a bunsen burner burning mainly methane. In a laboratory under normal gravity conditions and with a closed oxygen valve, a bunsen burner burns with yellow flame (also called a safety flame) at 1,000°C. With increasing oxygen supply less blackbody-radiating soot is produced, and the combustion reaction creates enough energy to ionize gas molecules in the flame, leading to a blue appearance. Flame temperatures of common items include a blowlamp at 1,300°C, a candle at 1,400°C, or a much hotter oxy-acetylene combustion at 3,000°C. Generally speaking, the coolest part of the flame will be red, transitioning to orange, yellow and white as the temperature increases as a result of changes in blackbody radiation. For a given flame's region, the closer to white on this scale, the hotter that section of the flame is. A blue-colored flame emerges when the amount of soot decreases and the blue emissions from molecules become dominant. The common distribution of a flame under normal gravity conditions depends on convection, as soot tends to rise to the top of a flame (such as in a candle in normal gravity conditions) making it yellow. In microgravity or zero gravity, such as an outer space environment, convection no longer occurs and the flame becomes spherical, with a tendency to become more blue and more efficient. There are several possible explanations for this difference, of which the most likely is the hypothesis that the temperature is sufficiently evenly distributed that soot is not formed and complete combustion occurs. [2] Experiments by NASA in microgravity reveal that diffusion flames in microgravity allow more soot to be completely oxidised after they are produced than do diffusion flames on Earth, because of a series of mechanisms that behave differently in microgravity when compared to normal gravity conditions. [3] Premixed flames in microgravity burn at a much slower rate and more efficiently than even a candle on Earth, and last much longer. [4] These discoveries have potential applications in applied science and industry, especially concerning fuel efficiency. References
This flame retardant clothing index site has been developed to help wayward users find the information they are looking for, no matter how they are mistakenly spelled or mistyped. This site is designed to help users find flame retardant clothing information for the following query variants:
If you would like to add or correct the content of this site, or if you are interested in supporting the efforts of misspelledsearch.com by placing your product information on these flame retardant clothing pages, please contact mistype@gmail.com for details. This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "flame". |