Air 02 : (1) The atmosphere; the mixture of gases that surrounds the earth and contains approximately 79 percent nitrogen, 20 percent oxygen, and 1 per-cent other gases including water vapor. (2) Radio communication
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}