what is buyoyancy ?
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In physics, buoyancy or upthrust, is an upward force exerted by a fluid that opposes the weight of an immersed object. In a column of fluid, pressure increases with depth as a result of the weight of the overlying fluid. Thus the pressure at the bottom of a column of fluid is greater than at the top of the column.
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When an object is fully or partially dissolved in a fluid it exerts an upward force called buoyant and this phenomenon is called buoyancy. Buoyancy is also known as upthrust .
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