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Fluid statics or hydrostatics is the branch of fluid mechanics which deals with the study of fluids at rest and the pressure exerted by it on an immersed object. If your question is about the study of fluids in motion, use the tag "fluid-dynamics" instead.
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What size hole will let air in but keep an 8"column of water from leaking out? [duplicate]
I have a 8 inch tall sports bottle into which I would like to make an air vent but not have the bottle leak when tipped up. What size hole would accomplish that?