Question

define buoyancy by giving one activity

Answer 1

The buoyancy force exerted on a body immersed in a fluid is equal to the weight of the fluid displaced by the body Ship is floating on water

Answer 2

buoyancy also known as 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.
example a block of wood in water