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The reason Coke and Mentos explode in a frothy fountain of bubbles is due to the process called nucleation. Nucleation is the phenomenon where a dissolved gas in a liquid is able to come out of solution by forming in a crack, crevice, hole, or any small irregularity in the container. The stream of bubbles that can bee seen bubbling to the surface of a glass of champaign is a perfect example; the dissolved gas in the champaign comes out of solution by forming in small irregularities at the bottom of the glass of champaign. Mentos are full of extremely small holes on their surface, giving dissolved gas a place to form and turn into bubbles. When the Mento is dropped into the Coke, millions of bubbles of CO2 form instantaneously on the Mento's surface through nucleation. Thus, much of the dissolved CO2 in the Coke comes out of solution instantaneously and bubbles up to the surface, creating the wonderful fountain of soda that everyone loves!

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14y ago

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