Was less Diet Coke left in the bottle after the reaction with the whole candies compared with the crushed ones? In the Diet Coke bottle the Mentos candy provides a rough surface that allows the bonds between the carbon dioxide gas and water to break more easily, helping to create carbon dioxide bubbles. As the Mentos candy sinks in the bottle, the candy causes the production of more and more carbon dioxide bubbles, and the rising bubbles react with carbon dioxide that is still dissolved in the soda to cause more carbon dioxide to be freed and create even more bubbles, resulting in the eruption.
Because Mentos candies are rather dense, they sink rapidly through the liquid, causing a fast, large eruption.
The crushed Mentos candies, however, are not as dense as the whole ones, which causes them to sink more slowly, creating a relatively small cola fountain, which should also leave more liquid in the bottle than the larger eruption with whole Mentos candies did. Cleanup Hose off any part of a building that was splashed with Diet Coke.
If you try this project with regular Coke, the eruption should still happen but its sugary content may make cleaning more difficult. This activity brought to you in partnership with Science Buddies.
Already a subscriber? Sign in. Thanks for reading Scientific American. Create your free account or Sign in to continue. See Subscription Options. Go Paperless with Digital. Build a Cooler. Get smart. Sign up for our email newsletter. Sign Up. Support science journalism. Knowledge awaits. See Subscription Options Already a subscriber? Create Account See Subscription Options. Continue reading with a Scientific American subscription. Watch the slow-motion video carefully, and observe how the Brute garbage can the blue seamless one deforms during the explosion.
The multi-colored garbage can does not fare as well. Scientists are interested in the details of how volcanoes erupt, so they analyze temperature, pressure, and the chemistry of magma. Some volcanologists study the way gas bubbles nucleate and expand, using laboratory models to simulate magma processes. Gases are dissolved in magma at pressures many thousands of times atmospheric pressure. Volcanic gas is dissolved in magma; at the surface of the earth, it escapes to the atmosphere. The sudden release of pressure on a confined gas produces an explosion.
Back to top. University of Hawaii at Hilo. Skip to content Geology Department. What causes the explosion when Mentos are dropped into Diet Coke? What causes the explosion in the garbage can with tennis balls?
Coupled with the ingredients in the candy, this physical property makes Mentos an explosive addition to a bottle of soda. This theory, suggested by "Mythbusters," was confirmed by Tonya Coffey, a physicist at Appalachian State University, and published in the American Journal of Physics in Max Roman Dilthey is a science, health and culture writer currently pursuing a master's of sustainability science.
Based in Massachusetts, he blogs about cycling at MaxTheCyclist. The Effect of Temperature on Bubble Solution. How to Make a Realistic Erupting Volcano. How to make a "Volcano Experiment" Easy and Fun. Your Body On: Halloween Candy. How Bubbles Are Made. Fun Exploding Science Experiments.
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