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GLOSSARY  Back
Air
The mixture of gases that surrounds the earth. The composition of air is 78.08% nitrogen, 20.95% oxygen, 0.03% carbon dioxide and 0/93% argon. Standard air has a density of 0.075 lb/ft3 (1.2 kg/m3) measured dry at 70°F (21°C) and 760 mm Hg pressure, M.W. 28.3.
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