Chemical Symbol: None
Synonyms: Compressed air, atmospheric air, the atmosphere (of the earth)

Description
Air is the natural atmosphere of the earth, a nonflammable, colorless, odorless gas that consists of a mixture of gaseous elements (with argon, water vapor, a small amount of carbon dioxide, and traces of many other constitutes).

Uses
Air meeting particular purity specifications has many important applications. Some of these applications are in medical, undersea, aerospace, and atomic energy fields. Air is also used in SCBAs used by industrial, emergency response, and fire fighting personnel, and as a power source for various types of pneumatic equipment.