Air contains about 21% oxygen by ______

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Solution

Air is a mixture of gases that is present around us.
It contains about 78% of Nitrogen(N₂), 21% of Oxygen(O₂), and 1% of other gases by volume.
Thus, air contains about 21% oxygen by volume

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Air contains about 21% oxygen by ______

Air is a mixture of gases that is present around us.It contains about 78% of Nitrogen(N2), 21% of Oxygen(O2), and 1% of other gases by volume.Thus, air contains about 21% oxygen by volume

Air is a mixture of gases that is present around us.
It contains about 78% of Nitrogen(N₂), 21% of Oxygen(O₂), and 1% of other gases by volume.
Thus, air contains about 21% oxygen by volume