Here, is the moment of total area of contact about free water surface. Therefore, the total pressure is expressed as, Show the elemental strip of surface area located at x from the free liquid surface as in Figure (2).Įxpress the pressure intensity at the elemental surface.Ĭonsider the number of elemental strips and applying the integration to get total hydrostatic force. Show the element submerged in the liquid distance ( h) from the liquid surface as inĮxpress the forces on the horizontal plane. The location of total pressure is referred as the center of pressure which is always below the center of gravity of the surface in contact. If the liquid is at rest then there is no tangential force, and hence the total pressure will act perpendicular to the surface with contact. Hydrostatic force refers to the total pressure acting on the layer or surface which is in touch with the liquid or water at rest. The liquid is most often water but it could be oil or some other liquid. When a liquid is contained by a surface, such as a dam, the side of a ship, a water tank, or a levee, it is necessary to calculate the force and its location due to the liquid.
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