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what is buoyant force?
The buoyant force is an  an upward force exerted by a fluid  in  opposite to  the weight of an immersed object. Consider an  object is placed in a fluid it  exerts an upward force which  comes from the pressure exerted on the object by the fluid. 

note : Archimedes’ Principle states that  the upward buoyant force is equal to the weight of the displaced volume of  liquid.   
                             Buoyant force = Weight of the displaced fluid 


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