Mentos___Diet_Soda - The makers of Mentos are thrilled by...

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The science behind the soda geyser You've seen it. Diet Coke + Mentos = cola fountain. Here's why the combination has such a messy result B Y C HRIS E MERY SUN REPORTER PUBLISHED A UGUST 4, 2006 Although they feel smooth, the candies are covered with microscopic nooks and crannies that act as seeds from which gas bubbles can grow. Those imperfections - known as "nucleation sites" in physics - break the tension between the water molecules. They also reduce the energy needed for the CO2 to escape the net of water molecules and form bubbles. Dust particles have a similar nucleation effect on the freezing temperature of water, raising it so that snowflakes form at warmer temperatures. Similarly, kids making rock candy often use string as a nucleation site for sugar crystals. Mentos may be the candy of choice for geysers because they just fit inside the neck of a two-liter bottle but still provide a large surface area for bubble formation.
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Unformatted text preview: The makers of Mentos are thrilled by the attention the online videos have brought to their product - not to mention a recent surge in sales they attribute to the publicity. "One of the estimates I heard is that there are close to 3,000 geyser videos online," said Pete Healy, the vice president of marketing for Perfetti Van Melle, the Italian company that makes Mentos. He said the company is planning future projects with the two video makers from Maine - and just this week it launched a Web site where experimenters can post their own Mentos geyser videos. Healy thinks at least some of the public has been aware of the geyser effect since the early 1990s, when Mento ads first appeared on TV. "They bubble up every four or five years," he said. Correction: Effervescence was incorrectly referred to as evanescence in the print edition. The Sun regrets the error.
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This note was uploaded on 11/09/2011 for the course CHEM 100 taught by Professor Sdfsdf during the Winter '08 term at BYU.

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Mentos___Diet_Soda - The makers of Mentos are thrilled by...

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