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Why does liquid travel up a straw when you sip through it?

April 26, 2017liquid SIP straw Travel

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Why does liquid travel up a straw when you sip through it?

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But this is also happening: When you sip on a straw you cause a reduction in air pressure inside the straw. The air pressure on the liquid outside the straw is now greater than on the inside. Because nature doesn’t like an imbalance, it gets pushed down into the glass and thus up the straw.