WHAT IS THE PERCENTAGE OF OXYGEN IN ENVIRONMENT
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Diatomic oxygen- 20.8% of any given volume of air.
Anonymous:
21%
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Between 20% - 21% ( 20.5% or 21% because 78% Nitrogen )
20.5% Oxygen
0.5% Argon
1% Other
20.5% Oxygen
0.5% Argon
1% Other
it is 20%
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