Question 20
EasyOriginal questionAbout what fraction of the air, by volume, is nitrogen?
Show the answer and explanation
CorrectNot quiteAnswer D
Correct answer: D
Explanation
Dry air is about 78% nitrogen, 21% oxygen and about 1% argon, with a small amount of carbon dioxide.
Worth noting
21% is oxygen, the figure most often confused with nitrogen's.
- Concept
- Composition of air
- Typical timeTypical
- 35 s
- Your timeYours
- —
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