The Diet Coke and Mentos eruption is one of the most popular science experiments on the planet. My only advice? Don’t try to stop the geyser! 😂 It may clean out your sinuses but it could hurt and do damage! For those interested in the science, here’s the deal. Carbonated beverages are full of dissolved carbon dioxide gas, which forms bonds with water. While the soda is in the bottle, the gas is kept in solution by the bottle's pressurized conditions. When you pour some soda into a glass, some g