A Mentos eruption (also known as a Mentos and Diet Coke geyser, Soda Geyser) has become a backyard science experiment fad first demonstrated by “science guy,” Steve Spangler. It has also become an internet phenomenon, with videos of Mentos eruptions and even Mentos performance art pieces being posted on sites like Google Video and YouTube.
The experiment involves dropping several Mentos candies (usually 5–8) into a bottle of diet cola, resulting in an eruption. This reaction is thought to occur because of rapidly expanding carbon dioxide bubbles inside once the Mentos are introduced to the carbonation.
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