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What (who) is acetylene$685$ - definition
![King [[Cædwalla of Wessex]] (c. 659–688)](https://commons.wikimedia.org/wiki/Special:FilePath/Cædwalla in Barnard Chichester mural (full body).jpg?width=200 "King [[Cædwalla of Wessex]] (c. 659–688)")
![[[Kharijite]] controlled areas}}](https://commons.wikimedia.org/wiki/Special:FilePath/Second Fitna Territorial Control Map ca 686.svg?width=200 "[[Kharijite]] controlled areas}}")
![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
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Year 685 (DCLXXXV) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. The denomination 685 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
