The power of attractive forces within water as demonstrated by a siphon.
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Prior knowledge & experience:
Try to figure out what is inside the pitcher that allows it to act as follows.
Why did the water not start flowing immediately? Why did the pitcher release more water than was put into it? Why did the water not flow out again when it was returned to the pitcher?
Water fills a tube that begins a syphon.
Air pressure causes the water to flow through the tube.
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