MLA Citation: Bloomfield, Louis A. "Question 1375"
How Everything Works 14 Dec 2017. 14 Dec 2017 <http://howeverythingworks.org/print1.php?QNum=1375>.
1375. How do the automatic soda dispensers at fast food joints know when the cup is full? — MB, San Diego, CA
Those dispensers measure the volume of liquid they dispense and shut off when they've delivered enough liquid to fill the cup. They don't monitor where that liquid is going, so if you put the wrong sized cup below them or press the button twice, you're in trouble.

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