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The volume percentage of oxygen in the atmosphere is 21%, which..
  • A
    decreases with increasing altitude.
  • B
    increases with increasing altitude.
  • C
    is dependent on the present air pressure.
  • D
    is constant at all altitudes for conventional aircraft.

Composition of the Atmosphere

The atmosphere contains about 21% of oxygen. The other gases in the air are nitrogen, about 78%, and small amounts of carbon dioxide, water vapour and the rare gases such as argon. These volume percentages for each gases remain constant to about 70 000 ft - well within the altitudes at which conventional aircraft operate.

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