(1) Observers have long known that Titan's atmosphere contains methane, ethane, acetylene and many other hydrocarbon compounds.

(2) To transport gaseous substances such as propane or acetylene economically, they must be compressed greatly to fit into containers of a reasonable size.

(3) Acrylonitrile is another product of acetylene , formed in a reaction with hydrogen cyanide.

(4) We use the heat produced by the burning of acetylene in the flame of the oxyacetylene torch to make welds.

(5) A delicate 24-hour cooling operation saw roads and houses cordoned off as the emergency services tried to prevent the acetylene , propane and oxygen cylinders from exploding in Thornton Heath.