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Stopping Leaks

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Water jets out of a hole in the side of a tube.

As the water level drops, the driving pressure decreases and the liquid forms a rivulet on the side of the tube.

As the pressure drops further, the rivulet breaks up into discrete droplets.

Finally, the pressure in the tube is low enough that the curvature of a droplet is enough to act as a cap that stops the leak.

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