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Putting Mentos candy into a bottle of diet cola creates an amazing liquid geyser. The carbon dioxide bubbles in the soda attach themselves to thousands of tiny surface pits in the Mentos candy. The bubbles become numerous, creating gas and rapidly pushing the liquid out of the bottle. The effect is intensified because the heavy Mentos candies sink in the bottle, increasing the number of bubbles produced.
Soda pop is full of carbon dioxide gas. The Mentos candy provides a place for the dissolved carbon dioxide to “escape” from the liquid. This process is called nucleation. There are so many little holes on the Mentos (so many places for bubbles to gather) that the escaping gas creates a powerful “geyser.”