Percentage of nitrogen in air by volume ………………
Percentage of nitrogen in air by volume ………………
A) 20.9%
B) 78.1%
C) 0.03%
D) 0.1%
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Percentage of nitrogen in air by volume ………………
A) 20.9%
B) 78.1%
C) 0.03%
D) 0.1%