A hole is 0.5 m below the water surface of a tank, and 2 m above the ground (g = 10 m/s²). The horizontal range of the jet is:

Since the same volume of fluid must pass every cross-section per second (continuity), the fluid speeds up where the pipe narrows; Bernoulli's equation then says this faster-moving fluid has lower pressure - the principle behind a venturi meter and an aircraft wing's lift.