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    What is the Froude number?

    The Froude number is a dimensionless number used to quantify the influence of gravity on the motion of a fluid. It is the ratio of the inertia forces to the gravitational forces related to the mass of water displaced by a floating boat.

    The air-water interface

    Water and air are two different fluids that enter into contact at the ocean’s surface at what is called the air-water interface. This interface plays an important role in ship hydrostatics and in describing the flow of water around a vessel.