Question

Percentage of oxygen and nitrogen in atmospheric air

Answer 1

By volume, dry air contains 78.09%nitrogen, 20.95% oxygen, 0.93% argon,0.04% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere.

Answer 2

78.09% nitrogen,20.95% oxygen