Oxi-acetylene flame
1. A blue, non-sooty flame produced by burning acetylene gas in the presence of pure oxygen gas and used for welding metals
Saturated hydrocarbons
2. Hydrocarbons, like alkanes, that have only single bonds between any two neighbouring carbon atoms, for example, methane, propane, and butane
Unsaturated hydrocarbons
Hydrocarbons, like alkenes and alkynes, that have double or triple bonds between neighbouring carbon atoms, for example, ethene and ethyne