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There is 21% of oxygen in the air.
About 16% of the air you expel is oxygen.
21% Oxygen, 78% Nitrogen, 1% other gasses in out atmosphere.
21% of the air is oxygen
Actually, the percentage of oxygen in air does not decrease in high altitudes. What does decrease is the pressure of the air. So when breathing in at higher altitudes, the lower pressure causes less air to rush into the lungs as each breath is taken. At sea level, air contains about 21% oxygen. At 18,000 feet elevation, air still contains about 21% oxygen; there is just less air!People (and animals, for that matter) adapt over a period of many years to a high-altitude environment. Their bodies become more efficient at obtaining and using oxygen.
There is 21% of oxygen in the air.
Air is approximately 20% Oxygen.
About 16% of the air you expel is oxygen.
Concentration of oxygen in dry air is 20,946 %.
21% of the atmosphere is oxygen.
Oxygen - yes. Air - no. Not much of that around underwater.
Air contains abundant oxygen and trace amounts of hydrogen.
About 20% of the volume of the air in the room is oxygen.
A small percent . exhaled air always contains oxygen .
99% of air
Oxygen is it's own element. Air is a combination of elements. That question is not even a sentence, but I think your answer is Air is 19% Oxygen at sea level.
ideally 21% (20.95%)