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Lift:

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The most important force acting in flight which produces low pressure and high pressure above and below an airfoil of a wing. This pressure creates an upward net force and creates the amount of lift needed to fly an airplane. Lift also needs to include plane speed and wing angle/shape(angle of attack) in order to produce the needed pressures that allow lift to be proportional to the angle of attack(tilt in wing degrees). This allows for angles of attack between -10° and 15°. With an increase in extreme degrees of attack, the air will stop following the surface of the wing and create turbulance or what is known as a stall.

*Fact : "Lift and air density: The reaction forces are proportional to the accelerated mass and therefore proportional to the density of the air. At an altitude of 12.000 m density and air pressure are approximately a quarter of their standards at sea level. Consequently the lift is reduced to a quarter as well. This loss can be compensated by doubling the velocity." (Physics of Flight)

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