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Human Performance
2.2 The atmosphere we fly in
(Menneskelig ydeevne 1 – 2 videos)
Chemically speaking, the composition of the atmosphere is as follows:
78 % nitrogen
21 % oxygen
0,03 % carbon dioxide
0,9 % argon
0,07 % water vapor and other substances
The atmosphere maintains this percentage composition throughout its
altitude.
Physically, however, pressure changes with altitude. Pressure can be defined as
the weight of the air column above.
It is widely known that air is compressible. As a result, pressure changes are
greatest near the Earth's surface.
Air also has the property of expanding when heated.
2.3 Human respiratory system
All animals and humans must continuously "breathe" to supply the body with
oxygen and remove carbon dioxide. Different animal groups have solved this
task in various ways.
Fish have gills, which extract oxygen from water. Insects have a complex system
of tiny air tubes called tracheae.
Flight Theory PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 133
