13 / 20

What is the most abundant gas in the atmosphere?

  • A

    Oxygen

  • B

    Carbon Dioxide

  • C

    Nitrogen

  • D

    Argon

COMPOSITION OF THE ATMOSPHERE
The atmosphere consists mainly of several gases in fairly stable proportions:

  • 21% oxygen
  • 78% nitrogen
  • 0.93% argon
  • 0.03% carbon dioxide
  • 0.04% trace (rare) gases

These percentages remain essentially unchanged up to around 70 000 ft, which is above the normal operating altitude of most conventional aircraft. From an aviation perspective, oxygen is the most critical gas for pilots and nitrogen is the most plentiful gas in the atmosphere.

Your Notes (not visible to others)



This question has appeared on the real examination, you can find the related countries below.

Keyboard Shortcut Use Keyboard Shortcuts