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D'Alembert's paradox states that an inviscid (non-viscous), incompressible flow produces no drag on an object surrounded by such fluid, yet it does produce lift. It is named after Jean le Rond d'Alembert Imagine that you're flying in an airplane. As you fly through the air, the negative pressure above the wings pulls them up (provides lift) but the air also creates drag on the same wing. In order to take off and fly, a plane must sustain sufficient lift to overcome the drag created. In a specific type of liquid this is not the case. lift can be created without drag to overcome. (BTW, there is a commonly held belief that planes fly because of the force of air pushing up under the wing, but this is not the case.) http://www.biologydaily.com/biology/D'Alembert's_paradox
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