Water is filled up to a height h in a beaker of radius R. The density of water is ρ, the surface tension of water is T and the atmospheric pressure is P0. Consider a vertical section ABCD of the water column through a diameter of the beaker. The force on water on one side of the section by water on the other side of this section has magnitude:
2P0Rh+Rρgh2−2RT
Force, F=∫h0(P0+ρgx)2Rdx−2TR=2P0Rh+Rρgh2−2TR