What makes your milkshake go up your straw?

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4 Answers

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Air pressure.

When you suck on the straw, the pressure inside your mouth is less than the outside air pressure. Because of the imbalance, the outside pressure pushes the milkshake down the glass, up the straw, and into your mouth.
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Well, actually it is atmospheric pressure that makes the milkshake go up the straw.

By sucking on the straw, you produce a low pressure in the straw and your mouth, the higher atmospheric pressure thus pushes the milkshake up the straw.

Astroturf
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The air pressure you use to suck it up pulls it in for you so technically the answer to your question is air pressure and sucking
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it's just the suction created in ur mouth.......since a milkshake is a liquid it neither compressible nor expandable........it has no other go... else to enter ur mouth.
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