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quote:Originally posted by daveshortsWhat orientation were you holding the bottle in when you were filling and emptying it?
quote:Originally posted by ROBERTVortices & turbulence may explain your observation.Here is an aerodynamic analogy:-" Vortices last longer in calm air, and atmospheric turbulence hastens their decay. Decay is the dying out of eddies. All aircraft produce wake vortices—much like two small horizontal tornadoes trailing behind the wing tips. The larger and heavier the plane is, the stronger the wake. That means small aircraft that follow larger ones can encounter turbulence if they are not kept far enough apart. The turbulence can be severe enough to cause a plane to crash. "http://media.nasaexplores.com/lessons/01-071/5-8_1.pdf The water in your "filling" bottle was more turbulent than when "emptying".