What percent of Earth's atmosphere is inert gas?

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Multiple Choice

What percent of Earth's atmosphere is inert gas?

Explanation:
Inert gases in this context are the noble gases present in the air. The bulk of Earth's atmosphere is nitrogen and oxygen, leaving only a small fraction for all the other gases, including the inert ones. Argon is the largest of these inert gases, about 0.93% of the atmosphere by volume, with the remaining noble gases (neon, helium, krypton, xenon, etc.) adding only tiny amounts. When you add those trace amounts together, they total roughly 1% of the air. So the best estimate is about 1%.

Inert gases in this context are the noble gases present in the air. The bulk of Earth's atmosphere is nitrogen and oxygen, leaving only a small fraction for all the other gases, including the inert ones. Argon is the largest of these inert gases, about 0.93% of the atmosphere by volume, with the remaining noble gases (neon, helium, krypton, xenon, etc.) adding only tiny amounts. When you add those trace amounts together, they total roughly 1% of the air. So the best estimate is about 1%.

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