The explosive limit of a gas or a vapour, is the limiting concentration (in air) that is needed for the gas to ignite and explode. There are two explosive limits for any gas or vapor, the lower explosive limit (LEL) and the upper explosive limit (UEL). At concentrations in air below the LEL there is not enough fuel to continue an explosion; at concentrations above the UEL the fuel has displaced so much air that there is not enough oxygen to begin a reaction. Concentrations of explosive gases are often given in terms of percent of lower explosive limit (%LEL). A gas is one of the four major phases of matter (after solid and liquid, and followed by plasma, that subsequently appear as a solid material is subjected to increasingly higher temperatures. ... Vapor (US English) or vapour (British English) is the gaseous state of matter. ... In chemistry, concentration is the measure of how much of a given substance there is mixed with another substance. ... Gasoline explosions, simulating bomb drops at an airshow. ... General Name, Symbol, Number oxygen, O, 8 Chemical series Nonmetals, chalcogens Group, Period, Block 16, 2, p Appearance colorless (gas) very pale blue (liquid) Atomic mass 15. ...

Controlling gas and vapor concentrations outside the explosive limits is a major consideration in occupational safety and health. Methods used to control the concentration of a potentially explosive gas or vapor include use of sweep gas, an inert gas such as nitrogen or argon to dilute the explosive gas before coming in contact with air. Use of scrubbers or adsorption resins to remove explosive gases before release are also common. Gases can also be maintained safely at concentrations above the UEL, although a breach in the storage container can lead to explosive conditions or intense fires. It has been suggested that Worker safety and health be merged into this article or section. ... General Name, Symbol, Number nitrogen, N, 7 Chemical series nonmetals Group, Period, Block 15, 2, p Appearance colorless gas Atomic mass 14. ... General Name, Symbol, Number argon, Ar, 18 Chemical series noble gases Group, Period, Block 18, 3, p Appearance colorless Atomic mass 39. ... Adsorption is a process that occurs when a gas or liquid or solute (called adsorbate) accumulates on the surface of a solid or more rarely a liquid (adsorbent), forming a molecular or atomic film (adsorbate). ... It has been suggested that this article or section be merged with Flame. ...

The explosive limits of some gases and vapors are given below. Concentrations are given in percent by volume of air.

In chemistry, acetone (also known as propanone, dimethyl ketone, 2-propanone, propan-2-one and β-ketopropane) is the simplest representative of the ketones. ... Acetylene (systematic name: ethyne) is the simplest alkyne hydrocarbon, consisting of two hydrogen atoms and two carbon atoms connected by a triple bond. ... Benzene, also known as benzol, is an organic chemical compound with the formula C6H6. ... Butane, also called n-butane, is the unbranched alkane with four carbon atoms, CH3CH2CH2CH3. ... Ethanol, also known as ethyl alcohol or grain alcohol, is a flammable, colorless, slightly toxic chemical compound with a distinctive perfume-like odor, and is the alcohol found in alcoholic beverages. ... Chemical Structure of Ethylbenzene Ethylbenzene is an organic chemical compound which is an aromatic hydrocarbon with the chemical formula C8H10. ... Ethylene (or IUPAC name ethene) is the chemical compound with the formula CH2CH2. ... Diethyl ether, also known as ether and ethoxyethane, is a clear, colorless, and highly flammable liquid with a low boiling point and a characteristic smell. ... This article is about the fuel. ... Gasoline is a petroleum-derived liquid mixture consisting mostly of hydrocarbons and enhanced with benzene or iso-octane to increase octane ratings, used as fuel in internal combustion engines. ... the 3rd ingredient in big mac ... R-phrases , , , , S-phrases , , , , , , , Flash point −4 °C Autoignition temperature 285 °C Explosive limits 1. ... This article is about the chemistry of hydrogen. ... Hydrogen sulfide (hydrogen sulphide in British English), H2S, is a colorless, toxic, flammable gas that is responsible for the foul odor of rotten eggs and flatulence. ... It has been suggested that RP-1 be merged into this article or section. ... Methane is a significant and plentiful fuel which is the principal component of natural gas. ... R-phrases , , , , S-phrases , , , , , , , Flash point 13 °C Autoignition temperature 220 °C Explosive limits 1. ... Pentane (also known as amyl hydride or skellysolve) is an alkane hydrocarbon with the chemical formula CH3(CH2)3CH3. ... Propane is a three-carbon alkane, normally a gas, but compressible to a liquid that is transportable. ... Propylene, also known by its IUPAC name propene, is an organic compound having the chemical formula C3H6. ... C8H8 redirects here. ... Toluene, also known as methylbenzene or phenylmethane is a clear, water-insoluble liquid with the typical smell of paint thinners, redolent of the sweet smell of the related compound benzene. ... The term xylenes refers to a group of 3 benzene derivatives which encompasses ortho-, meta-, and para- isomers of dimethyl benzene. ...

References

• David R. Lide, Editor-in-Chief; CRC Handbook of Chemistry and Physics, 72nd edition; CRC Press; Boca Raton, Florida; 1991; ISBN 0-8493-0565-9

• MSDS(Material Safety Data Sheet) from www.msdssearch.com and www.kosha.net (korea occupational safety & health agency).

en:Explosionsgrenze A City for All Seasons Location of Boca Raton in Palm Beach County, Florida. ... 1991 (MCMXCI) was a common year starting on Tuesday of the Gregorian calendar. ...