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Why Water Won't Flow From Faucet with 2000 Pa Pressure?
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[QUOTE="Merlin3189, post: 6850529, member: 542077"] The air pressures may be the same, but presumably the liquid pressures differ, else why would the water come out? Thanks for the comment on water svp. My conclusion from that is, the siphon will "break" when the pressure at the top of the link is 0.2 psi - so when the water height gives hydraulic pressure 0.2 psi less than atmospheric (about 1.4% less.) So you'd be better off with a liquid that had zero, or lowest, svp and no dissolved gases. They serve merely to push back against atmospheric pressure pushing the liquid upwards. Or perhaps not, if they lower the density of the liquid? One way of pumping water over a barrier is to blow air bubbles into the ascending pipe, so that the water level in that pipe is higher than in the source, and simply let it overflow the barrier. There may be a kinetic element at work here, but this tries to improve on the static mechanism. [ATTACH type="full" alt="airliftpump.png"]321673[/ATTACH] IMO it still comes down to the more dense liquid pushing the less dense mixture, rather than anything sucking. But I think I'm digressing, as usual on PF, so maybe we better leave it there? [/QUOTE]
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Why Water Won't Flow From Faucet with 2000 Pa Pressure?
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