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What (who) is acetylene divinyl - definition
.jpg?width=200 "Carbide acetylene gas generator, drip type (Autocar Handbook, Ninth edition)")
![A carbide lamp from 1900s at the Railway Museum in [[Flåm]], Norway](https://commons.wikimedia.org/wiki/Special:FilePath/Carbide lamp from Flam Railway museum.jpg?width=200 "A carbide lamp from 1900s at the Railway Museum in [[Flåm]], Norway")
![A French manufactured acetylene gas lamp, of circa 1910, mounted on a [[bicycle]]](https://commons.wikimedia.org/wiki/Special:FilePath/Carbide lamp on a bicycle.jpg?width=200 "A French manufactured acetylene gas lamp, of circa 1910, mounted on a [[bicycle]]")
![While LED electric lights have mostly replaced carbide lamps, some still prefer the "old-school" approach of using carbide lamps during recreational [[caving]] excursions.](https://commons.wikimedia.org/wiki/Special:FilePath/Caver In Hollow Hill New Zealand.jpg?width=200 "While LED electric lights have mostly replaced carbide lamps, some still prefer the \"old-school\" approach of using carbide lamps during recreational [[caving]] excursions.")
![Acetylene factory with annual capacity of 90,000 tons, commissioned in 2020 by [[BASF]].](https://commons.wikimedia.org/wiki/Special:FilePath/BASF Nsw.jpg?width=200 "Acetylene factory with annual capacity of 90,000 tons, commissioned in 2020 by [[BASF]].")
![Acetylene fuel container/burner as used in the island of [[Bali]]](https://commons.wikimedia.org/wiki/Special:FilePath/Laskarbit.jpg?width=200 "Acetylene fuel container/burner as used in the island of [[Bali]]")
Acetylene (systematic name: ethyne) is the chemical compound with the formula C2H2 and structure H−C≡C−H. It is a hydrocarbon and the simplest alkyne. This colorless gas is widely used as a fuel and a chemical building block. It is unstable in its pure form and thus is usually handled as a solution. Pure acetylene is odorless, but commercial grades usually have a marked odor due to impurities such as divinyl sulfide and phosphine.
As an alkyne, acetylene is unsaturated because its two carbon atoms are bonded together in a triple bond. The carbon–carbon triple bond places all four atoms in the same straight line, with CCH bond angles of 180°.
Wikipedia
Carbide lamps, or acetylene gas lamps, are simple lamps that produce and burn acetylene (C2H2) which is created by the reaction of calcium carbide (CaC2) with water (H2O).
Acetylene gas lamps were used to illuminate buildings, as lighthouse beacons, and as headlights on motor-cars and bicycles. Portable acetylene gas lamps, worn on the hat or carried by hand, were widely used in mining in the early twentieth century. They are still employed by cavers, hunters, and cataphiles. Small carbide lamps called "carbide candles" or "smokers" are used for blackening rifle sights to reduce glare. They are sometimes referred to as "smokers" because of the sooty flame produced by acetylene.
