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A siphon is technically powered by gravity. Once a tube is flowing, if there is more volume of fluid being dropped to a lower level, the gravity can take over and continue the flow. From the fluid escaping from the outbound side, it develops a negative pressure on the other side that continues to supply the fluid to drop with, and continuously take advantage of the gravitational weight. The friction of the fluid will eventually stop the siphon, but if the tube is dropping down low enough from the original liquid source, the extra gravity force can keep it going forever.

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Q: What laws of Physics allows a siphon to work?
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