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Home > Exam Questions > ATPL - Airline Transport Pilot Licence > Human Performance and Limitations > Which option best describes the approximate composition of contemporary dry atmospheric air by volume?

338 - ATPL Question Bank in English - Which option best describes the approximate composition of contemporary dry atmospheric air by volume?

Question 338 - Human Performance and Limitations - ATPL - Airline Transport Pilot Licence

78% helium, 21% oxygen, 1% carbon monoxide, rest: rare gases

78% nitrogen, 21% oxygen, 1% carbon monoxide, rest: rare gases

78% helium, 21% oxygen, 0,03% carbon dioxide, rest: rare gases

About 78% nitrogen, 21% oxygen, 0.93% argon and 0.04% carbon dioxide, with smaller amounts of other gases.

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