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Originally Posted by Amizaur
About the noise becoming stronger with turbulent flow - of course but I'm not sure the difference is so sharp UNDERWATER, where is no air which can mix with water causing bubbles, splashing and noise.
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Correct me if Im wrong, but this argumentation(no air underwater) rules out cavitation, yet it happens. There is always air in water. I guess some "O's" are detaching from the H²O through mechanical force (creating kinda vacuum which then "sucks" the air out of the water, contrary to boiling where the heat is the reason).
So what OKO sais makes alot of sense to me.