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Why Water Won't Flow From Faucet with 2000 Pa Pressure?
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[QUOTE="Merlin3189, post: 6850374, member: 542077"] Agree there is a small amount of cohesion, but I'd have thought negligible in the context of water tank and pipes. (But I'll be interested to know how much: I haven't attempted a calculation myself. ) If a closed tube manometer is what I think, then I disagree. The gas pressure from the open end or experimental end, pushes the liquid up into the evacuated sealed tube. No external pressure, no liquid rise. A mercury barometer used to be made with a sealed tube filled with Hg. When inverted into a pool of Hg, the liquid would completely empty out if there were no air pressure pushing it up the tube. It doesn't matter how long the tube is and how much Hg is in to start with, the Hg only rises as far as the air pressure will push it. Cavitation is interesting. The water is under some pressure from its own weight, again pushing the liquid together, though it obviously does cohere to some degree. Do bubbles that form from dissolved gases count as cavitation? Do they redissolve quickly as pressure increases? I think cavitation is about the formation of water vapour bubbles when the surface pressure is below the svp, and the significance is the sudden collapse as the pressure rises again - but I'm definitely not particularly informed on this topic. [/QUOTE]
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Why Water Won't Flow From Faucet with 2000 Pa Pressure?
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