When we suck water from a water bottle , our lips tend to experience a vaccume. Why does this happen?

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Solution

If the bottle is completely full and the seal is good and inflexible then you can't suck water out. Sucking just produces a partial vacuum so that (normally) air pressure would force the liquid up the straw. By sealing the bottle (and assuming the bottle is made of rigid material, such as glass) then there is no pressure being exerted to force water out. It's possible a very small amount may rise up the straw because of dissolved gases being released.

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