Percentage of nitrogen by volume in air is:
Correct answer: A. 78%
- A. 78%
- B. 50%
- C. 20%
- D. 98%
Explanation
By volume, the dry air in Earth's atmosphere is about 78.08 percent nitrogen, 20.95 percent oxygen, and 0.93 percent argon. A brew of trace gases accounts for the other approximately 0.04 percent, including the greenhouse gases carbon dioxide, methane, nitrous oxide and ozone.
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