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PPL » Aircraft Tech Knowledge (A) » The Atmosphere

12.4 The Atmosphere

12.4.2 Name the principal gases which constitute the atmosphere.

The atmosphere is a mixture of gases that surrounds the Earth.

The 3 main gases are:

Nitrogen                    - 78%

Oxygen                      - 21%

Trace Gases              - 1%      (carbon dioxide, helium, argon, ozone)


12.4.4 Define air density.

Air Density is a fundamental property of atmosphere.

It relates to an amount of molecules in a given volume of air.


12.4.6 Explain how air density varies with altitude within the atmosphere.

As you go up in altitude, the amount of molecules in the air decreases.

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