Buoyancy

If a body is dipped into a liquid substance (picture on the left), the pressure on the lower surface is greater than the pressure on its upper surface. The difference of pressure occurs because the two ends of the body are each located in different depths of the liquid substance (h₁ and h₂ ).

The force which looks vertically downwards F₁, is smaller than the counteracting force F₂. The difference between F₂ and F₁ is called Buouyancy (F_A ).