Question

How much percentage of oxygen in environment​

Answer 1

Answer:

21% by volume of air is oxygen (1/5th)

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Answer 2

Answer:

Explanation:

What is the current percentage of oxygen in the atmosphere? 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.