define buoyancy or buoyant force
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The upward force acting on an object when partly or wholly immersed in a fluid is called buoyant force.
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Buoyancy or buoyant force is the force which acts on an object when it is floated or immersed in a fluid in the upward direction. Its magnitude is equal to the weight of the fluid which that is displaced when the body is immersed or floated in the fluid.
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