All liquids in a state of equilibrium exert energy on the materials it comes in contact with. There are 2 forms, hydrostatic load or external forces. When pushing against a level wall, the fluid applies equal force at assorted points on the wall. helpful resources When an object is totally immersed in a liquid, vertical force is applied to the object at every point. These vertical forces are buoyancy, and the concept on its own is more fully described by Archimedesâ€™principle. When hydrostatic force is exerted on an area of liquid, this becomes hydrostatic pressure. These concepts are applied to the containers used by plumbing, wells, and fountains.