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**Systematic name:** Ethyne
**Molecular formula:** C₂H₂
**Chemical formula (condensed):** CH≡CH
**Molar mass:** 26,04 g/mol
**Information:** Acetylene is the simplest alkyne known. Under normal conditions it is a colourless, odourless and flammable gas. It can explode when mixed with air.
**Use:** Acetylene is used together with oxygen for the autogenous welding and cutting of metals. Is was previously used in carbide lamps.
