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Archimedes principle states that when a body is immersed partly or wholly in a fluid, then the liquid exerts an upward force/upthrust/buoyant force on the body which is equal to the weight of the fluid displaced by the body.
Buoyant force-
The buoyant force is given as
Where FB=Buoyant force
V= Volume of the solid body immersed in the liquid or Volume of the fluid displaced
So we can write
=weight of the fluid displaced
Where m=mass of the fluid displaced