how wings generate lift ?
A cross section an airplane wing will show the top surface to be more curved than the bottom surface. This shaped profile is called an 'airfoil'. During flight air naturally flows over and beneath the wing .
the air moving over the top of the wing has more distance to cover (because of the curvature it is forced to follow) in the same amount of time as the air passing below the wing, it has to move faster.
Faster moving air is less dense than slower moving air, so this speed difference results in a lower air pressure on top of the wing, and a higher air pressure below the wing (so the pressure is force per unit area so upper wing has more surface area so the pressure would be less than the lower wing) The result of this pressure gradient is that the wing, and hence the plane, is pushed upwards by the higher pressure.
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