10 of45 Fuselage Shape Training
  picture of a mountain showing that there is more air at lower elevations and less air at higher elevations Another reason to use a cylindrical shape has to do with air pressure at high altitudes. Have you ever gone to the top of a mountain and found it harder to breathe? That happens because the higher we go, the less air there is.
This picture gives you an idea where air is most dense, where most air is. It's most dense from sea level to around 5,000 feet of elevation.
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