Multiple choice

What is the total percentage of argon present in the atmospheric gases of air?

  1. 78%

  2. 21%

  3. 0.93%

  4. 0.039%

  5. 1%
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Dry air contains roughly (by volume) 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide and small amounts of other gases. Air also contains a variable amount of water vapour on average around 1%. In fact, air contains slightly less than 1% argon making it the third most abundant gas in air after nitrogen and oxygen. Argon is the most abundant and most used of the noble gases.

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