Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by function]

Anotations

Scope note:

A material used to propel an object or substance, including the following: an explosive used to propel a bullet or shell in firearms, a substance used as a source of the hot gases that provide the thrust in a rocket engine, or the compressed fluid in an aerosol container that causes its contents to be ejected.