Can one calculate the vacuum pressure created inside a bottle when pouring liquid from it?
Glass bottle 38mm diameter orifice
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No vacuum is created. Liquid will not flow out unless air bubble goes inside and equals the atmospheric pressure. (Unless one is taking about a bottle talker than the barometric height, about 1 meter if the liquid is mercury.) The bottle opening does not come into the picture. A wider opening makes it easier for the air bubble to enter.