What is the principle of buoyancy ?

The principle of buoyancy is called Archimedes’ Principle, as it was discovered by the Greek mathematician in the third century.The principle states that the buoyant force acting on an object placed in a fluid is equal to the weight of the fluid displaced by the object. An object that is completely immersed in a fluid displaces a volume of fluid, exactly equal to the volume of the object. The buoyant force, or the weight of the volume of displaced fluid, will depend on the density of the fluid as well as the displaced volume. The principle applies to all fluids including gases.

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