The energy of a fluid in motion can take various forms. An indication of the energy within a portion of the flow can be seen in the height of the flow-line, the speed of the flow, and the pressure within the moving fluid. Within some volume elements of the flow, the energy manifests as flow speed. Somewhere else, the energy may manifest as pressure. And at another position, the energy manifests as height.
As one form of energy decreases, one or both of the others must be increasing. Where the flow speed is high in a level flow, the pressure must be lower than another portion of the flow at that same level where the flow speed is low. Lower flow speed at the same level means higher pressure in an ideal fluid.
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