English: An airtight jar contains a bunch of water. The green pipe is started as a siphon so that water starts flowing out of the pipe. Because the pipe lets out water, the pressure on the inside of the jar is less than the pressure outside, so it causes air to be sucked in through the orange pipe. Because the pressure is going to tend to being the same inside and outside of the jar, the water is going to flow out of the pipe at the same speed and amount.
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