Bernoulli theorem is based on conservation of (a) momentum (b) mass (c) energy (d) angular momentum In general, Bernoullis theorem is a consequence of conservation of energy per unit volume between two points in a liquid flow. The shape of the aeroplane wings is such that when it moves forward, the air molecules at the top of the wings have a greater velocity (relative to the wings) compared to the air molecules at the bottom. Therefore in accordance with Bernoulli 's principle, the pressure at the top of the wings is less than that at the bottom. This results in a dynamic lift of the wings which balances the weight of the plane.
