If two fluids at different pressures exist on either side of an interface/object, the net force on that interface/object from the pressures of the fluids will be proportional to the difference in pres...If two fluids at different pressures exist on either side of an interface/object, the net force on that interface/object from the pressures of the fluids will be proportional to the difference in pressure of the fluids on either side. for the laminar flow of a fluid with no viscosity. P is the internal pressure of the fluid, v its speed, and y the height of the fluid relative to a fixed coordinate system.
