Why does coke explode with mentoes?

Answer 1

There are several reasons postulated, but the physics community has settled on nucleation as the reason.

The reason that the soda erupts so violently from the bottle is actually twofold: a decrease of the surface tension of the soda (due to dissolving Mentos), and an increase in nucleation sites (sites where bubbles of CO2 can form) within the bottle (due to the rough Mentos surface). Both of these factors make the carbon dioxide in the soda less likely to stay dissolved and more likely to become gaseous. The fountain effect is from all of the CO2 going from dissolved to gaseous at once, and at a great rate.

Answer 2

When Mentos candies are dropped into a bottle of Coke, the carbon dioxide in the soda rapidly forms bubbles on the surface of the candy. The Mentos candies have a rough surface that provides nucleation sites for the gas to rapidly escape, causing a rapid release of carbon dioxide. This release creates a significant amount of pressure inside the bottle, leading to a sudden and explosive eruption of soda.

Answer 3

Because of the acid in coke