Buoyancy Force (Upthrust)

Buoyancy Force (Upthrust)

When a body is immersed in a fluid, it appears to "lose" weight. The body experiences an upwards force due to being immersed in the fluid. This upwards force is called an upthrust.This upthrust or buoyancy force can be explained in terms of the force acting on the body due to the pressure acting on each of the surfaces of the body.The bottom surface of the body is at a greater depth than the top surface, therefore the pressure on the bottom surface is greater than the top surface. This results in a net force upwards on the body due to the liquid. This upward force is called the upthrust.Notice that the buoyancy force (upthrust) on an object depends on the difference in the pressure on the top and bottom of the object. Hence the value of this buoyancy force does not depend on the depth of the object under the surface.

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