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air
A mixture of odourless gases found in the atmosphere in the following approximate percentages by volume after water vapor has been removed.
gas % in atmosphere
Oxygen 20.95
Nitrogen 78.08
Argon 0.93
Carbon dioxide(CO2) 0.03
Other gases 0.01
Specific
clean air
References
Stedman's Medical Dictionary 27th ed, Williams &
Wilkins, Baltimore, 1999.