How much percentage of oxygen in environment
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21% by volume of air is oxygen (1/5th)
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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.
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