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physics in drinkng through a straw

Joe13

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Straws are everywhere and everyone sees them and knows what they are and everyone uses them. A lot of people dont know how a straw actually works. You may think that you are actually sucking hard enough to pull the liquid up but thats not actually what happens. Air pressure is pressing down through the straw and holding the liquid in the cup. but when you suck the air out of the straw you change the air pressure making it lower inside the straw than outside of the straw and the liquid is drawn upward. when you suck the air out you create a vaccume were there is no air and the liquid is free to move upward just as if it were still in the cup.

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