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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 made up of 3 main gasses:

Nitrogen                    - 78%

Oxygen                      - 21%

Trace Gases              - 1%


12.4.4 Define air density.

Density is the number of molecules in a given volume of air.


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


12.4.8 State the relationship between pressure/temperature and the density of an air mass.

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