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Explain Buoyancy. Why do we study Buoyancy in Fluid Mechanics?

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Buoyancy:-

The tendency of a fluid to uplift a submerged body, because of the upward thrust of the fluid, is known as the force of buoyancy or simply buoyancy. It is always equal to the weight of the fluid displaced by the body. It may be noted, that if the force of buoyancy is greater than the weight of the body, it will be pushed up till the weight of the fluid displaced is equal to the weight of the body. Then the body will float. But if the force of buoyancy is less than the weight of the body, it will sink down.

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