Question 737 Deck Safety

70% to pass

Ambient air, which you normally breathe, contains what percent of oxygen?

A 6%
B 10%
C 15%
D 21%
AI Explanation

The correct answer is D) 21%. Ambient air, which is the air we normally breathe, contains approximately 21% oxygen. This is the standard composition of dry air at sea level, as defined by the International Union of Pure and Applied Chemistry (IUPAC) and other regulatory bodies. The other options are incorrect because they do not accurately reflect the typical oxygen content in ambient air.

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Official Resources
46 CFR Lifesaving Equipment USCG Marine Safety Center USCG National Maritime Center
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