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20.8 percent
About 21% of air is oxygen.
There is approximately 21 % oxygen in our air.
Oxygen.
21% of the atmosphere is oxygen.
20.8 percent
A small percent . exhaled air always contains oxygen .
About 21% of air is oxygen.
Typically, the air you breathe is comprised of 18 to 21 percent Oxygen.
21 percent
oxygen
oxygen! There is 21 percent oxygen in inspired ( the stuff you breath in) air and 13 percent in expired(the stuff you breath out)
Air is 20.5 percent oxygen.
air is made of 19.98 percent oxygen 79 percent nitrogen and 2 percent carbon
21 percent.
The percent of oxygen is 27. this increases the natural percent of 21 by 6 percent causing living organisms to have too much oxygen.
This is the composition of the air.