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The Famous Co ke and Mentos Erup tion

The Famous Co ke and Mentos Erup tion. By: Courtney Horvat, Gary Kleinschmidt, and Casey Kelby. History of the Myth, the Fountain, the Legend…. Steve Spangler began the phenomenon when he appeared on 9 News in 2002 and again in 2005

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The Famous Co ke and Mentos Erup tion

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  1. The Famous Coke and Mentos Eruption By: Courtney Horvat, Gary Kleinschmidt, and Casey Kelby

  2. History of the Myth, the Fountain, the Legend… • Steve Spangler began the phenomenon when he appeared on 9 News in 2002 and again in 2005 • Eepybird.com continued the trend when a video featuring Fritz Globe and Stephen Voltz recreated the eruption with multiple fountains mirroring the fountain display at the Bellagio in Las Vegas

  3. History Continued… • Besides becoming an almost instant internet trend, it has also been seen on a variety of TV shows including Numb3ers, Bones, and Myth Busters • Many websites feature Mentos and coke video contests • Eepybird.com even provides step by step instructions (Thank you!) and sells merchandise World Record: 1,911 simultaneous geysers by students of Latvia’s School of Business Administration Turbia

  4. How does it work? When you drop the Mentos into the soda, the gelatin and gum Arabic from the dissolving candy break the surface tension. This disrupts the water mesh, so that it takes less work to expand and form new bubbles. Each Mentos candy has thousands of tiny pits all over the surface. These tiny pits are called nucleation sites - perfect places for carbon dioxide bubbles to form. As soon as the Mentos hit the soda, bubbles form all over the surface of the candy. Couple this with the fact that the Mentos candies are heavy and sink to the bottom of the bottle and you've got a double-whammy. When all this gas is released, it literally pushes all of the liquid up and out of the bottle in an incredible soda blast. (Steve Spangler Science)

  5. Our Experiment… • We went out and bought 40 bottles of Sprite and 40 bottles of coke (16 oz), Then we bought a few 6-packs of Mentos rolls • We made a stand out of scrap wood to angle the bottle at 45° from the horizontal to give the best trajectory and used a rubber band to fasten the bottle to the stand • We made cartridges out of bottle caps with holes in them, and strung Mentos on fishing line to eliminate errors when dropping in the Mentos

  6. Then we would place the bottle on the stand, quickly take off the cap, replace it with the cartridge and release the Mentos • Then we would measure the furthest spray • To measure weight, we measured the weight of the soda (weight of bottle minus weight of empty bottle, then compared it to weight of fluid in full bottle)

  7. What Happens Next?

  8. Go the distance: Diet Coke vs. Sprite • We wanted to see whether the Diet Coke and Mentos eruption would go farther than the Sprite and Mentos eruption, as stated on Eepybird.com Perrier, Coke, Sprite, Diet Coke. (Wikipedia)

  9. Go the Distance

  10. Go the Distance

  11. Go the Distance: Two-Sample T-test Assumptions: 2 independent SRS → assumed Normal population or n≥30 → n=40≥30 We reject Ho because p-value at 8.8265×10-7 is < α=0.05. We have sufficient evidence that the difference between the average of diet coke is greater than the average of sprite.

  12. Go the Distance: Two Sample t-interval We are 95% confident that the difference in the average spray distance of Diet Coke and Sprite is between 39.187 and 88.163 inches.

  13. How much weight is dissipated in the Diet Coke & Mentos eruption? • For our second experiment, we wanted to see if the eruption displaced half of all the liquid, so we weighed the liquid and tested our results…

  14. Does it loose half its weight? • Min: 5.4 • Q1: 10.4 • Med: 11.4 • Q3: 12.275 • Max: 12.9 • Mean: 10.906 • Std. Dev.: 1.753

  15. Does it lose half its weight?Matched Pairs T-test Assumptions: 2 dependant SRS → assumed (before and after) n≥30 → n=40≥30 We reject Ho because p-value at 9.4951×10-34 is < α=0.05. We have sufficient evidence that the average difference of net weight after the eruption is not equal to half the original weight.

  16. Does it lose half its weight?Matched Pairs T-test We are 95% confident that the average difference in the net weight of the liquid remaining in the bottles after eruption of Diet Coke and Mentos is between 10.524 and 11.621 fluid ounces.

  17. Bias/Error • Overspray under cap • Not enough time to screw it on all the way • Fishing line caught, hands in the way • Shaken soda/CO2 released between cap exchange • Holes in cap caused angle in spray • Weather/ Temperature • Heat as a factor in experiment: the warmer the better • Wind • Exact measurements • Scale • Measuring Spray • Drilling/Threading • Cracked some shell and lost some of nucleation sights

  18. How we feel… Overall the project was fun and interesting with all the science behind it While we may have had errors and biases, we performed our experiment to the best of our ability We feel that our results are accurate and that our methods helped us to achieve our accuracy

  19. Application to the Population • Diet coke is the best soda to use out of the Sprite/Diet Coke test • When doing a Diet Coke and Mentos experiment, the net weight loss will not equal half of all the weight

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