Variation of pressure with depth
Fluid statics · Physics
Bernoulli pipe
Interactive 3DNarrow the pipe and the flow speeds up while pressure drops — Bernoulli in action.
Controls
Drag the sliders or type a value — the simulation updates live.
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0.3×1×
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0.5×3×
Study notes
Water flows at 2 m/s through a 10 cm pipe that narrows to 5 cm. By continuity (A₁v₁ = A₂v₂), halving the diameter quarters the area, so the throat speed is 2×4 = 8 m/s. Bernoulli then says pressure drops at the throat — the manometer column there stands shorter. Try it with the throat slider.