DefinitionA <SELF-CONTAINED BREATHING APPARATUS> is a <BREATHING APPARATUS> that provides breathable air in an IDLH (Immediate Danger to Life and Health) atmosphere, and that is not dependent on a remote supply (e.g. through a long hose).
Derived from http://en.wikipedia.org/wiki/Self-contained_breathing_apparatus|If designed for use under water, it is called SCUBA ( self-contained underwater breathing apparatus).