Hydraulics & Fluid Mechanics
Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the

force of diffusion
force of friction
force of cohesion
force of adhesion

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Hydraulics & Fluid Mechanics
The horizontal component of force on a curved surface is equal to the

weight of liquid vertically above the curved surface
force on the horizontal projection of the curved surface
force on a vertical projection of the curved surface
product of pressure intensity at its centroid and area

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