Linked from
The 11 pages that link to Compressed air, each with the reason it gives.
PneumaticsRelated: It is the working fluid and stored-energy source in most pneumatic systems.
GasBroader topic: Its storage and release depend directly on gas compressibility.
Air gunRelated: Stored pressure is the direct energy source in many air-gun designs.
Pound per square inchRelated: Air compressors and pneumatic tools often use psi ratings.
Scuba setRelated: It is the usual cylinder gas in basic scuba sets.