define buoyant force
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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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Buoyant force is that which is exerted by a fluid when a body is immersed in it or submerged in it .
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