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PPT : Diet Coke and Mentos – What is really behind this physical reaction?
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The abrupt ‘fountain’ response of diet soda mixed with mint-flavored Mentos is well documented and much debated. It has been speculated that the cause of this phenomenon is most likely a combination of two physical reactions, related to the release of pressurized carbon dioxide contained in soda. 1) The surface roughness of Mentos provides many nucleation sites for CO2 bubbles to form, and 2) the gum arabic found in Mentos significantly reduces surface tension, allowing rapid escape of CO2. This semester, our PHY2210 class has conducted a series of experiments to clarify whether the intensity of the reaction is due more to the surface roughness of the candy or to the gum arabic contained in it. We selected materials, organic and non-organic, based upon their surface roughness and gum arabic content or lack thereof. These include: Mentos, Cake Mates, Wintergreen Lifesavers, liquid Gum Arabic, playground sand, and granular salt. An SEM is used to determine surface roughness microscopically (up to 10,000x magnification). We constructed a bottle stand (10 degrees off vertical) and a delivery mechanism for the materials to maintain consistency in our results. Gum arabic is administered by direct injection. Intensity of reaction is determined by measuring the amount of liquid remaining in the bottle 5 seconds after the material is dispensed. We report results comparing gum arabic concentration and surface roughness vs. reaction explosive power.
There is almost a direct correlation between fountain height and weight of the bottle after the trial. The height data here is estimated based on video capture, and represents the highest fountain created across either trial. The most interesting result is the Dawn/water mixture producing a fountain nearly 2x the height of the Wint-o-Green fountain while they had nearly the same remaining mass.
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Category : DietSource : www.physics.appstate.edu
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