Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by composition]
6. organic material
7. hydrocarbon

Anotations

Scope note:

A colorless hydrocarbon gas, the simplest of the alkynes, also called ethyne. Acetylene burns much more brightly than other gases and was used for stage lighting before electric lights were introduced. It burns with an intensely hot flame and is widely used as a fuel in oxyacetelene welding, soldering, and cutting of metals.