Oxygen content in normal air is which value?

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Multiple Choice

Oxygen content in normal air is which value?

Explanation:
Normal air at sea level contains about 21 percent oxygen by volume. This is the standard atmospheric composition used for ventilation, breathing air, and gas safety calculations. The air is mostly nitrogen (about 78%), with small amounts of argon and carbon dioxide. So 21% is the typical fraction you’d expect for fresh, normal air. Values like 18% or 19% would indicate hypoxic conditions, while 25% would be unusually oxygen-rich for ordinary air.

Normal air at sea level contains about 21 percent oxygen by volume. This is the standard atmospheric composition used for ventilation, breathing air, and gas safety calculations. The air is mostly nitrogen (about 78%), with small amounts of argon and carbon dioxide. So 21% is the typical fraction you’d expect for fresh, normal air. Values like 18% or 19% would indicate hypoxic conditions, while 25% would be unusually oxygen-rich for ordinary air.

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