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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