Conservation of energy for a flow moving in a streamline, but every term is divided by volume to give a sort of conservation of different pressures.
Essentially the equation shows that faster flow has lower pressure.
However, it doesn’t really apply to lift that well, though it forms part of a common but incorrect explanation.
Lift essentially forms because if you have curved flow, there is a pressure gradient acting towards the “centre” of that circle (this is derived by just considering the pressure/force balance on a small element of fluid) so pressure closer to the centre is lower than further away, which results in lower pressure above the wing than below due to its shape, and since force = pressure * area that causes a net force upwards.
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