What is buoyancy ?•  Buoyancy 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.

Illustrations:• The bottom of the fish is deeper so

there is more fore pushing up on it – a buoyancy

How to measure the buoyant force

• Weight of object in air- weight of object in water =upward buoyant force.

• The buoyant force is equal to the weight of the displaced water

Illustration with some images