It’s tough to really demonstrate the Mentos Geyser Tube in an exhibit hall filled with teahcers… until we created the Mentos Geyser Chamber. It’s a plastic box that measures 4 feet square and 7 feet tall. It’s the perfect enclosure to launch off a few hundred Mentos Diet Coke geysers. The only other thing you need is someone to stand inside the box for a few hours. Most of the time, Drew Vriesman is an undergraduate at the University of Colorado, Boulder, studying marketing. But when he puts on his intern hat at Steve Spangler Science, he’s never quite sure what to expect. Drew Vriesman and Taylor Marsh took turns launching geysers at the NAEYC 2008 conference in Dallas. Combined they launched 700 erupting Diet Coke geysers using over 4,000 MENTOS® Chewy Mints. The interns spent about 20 hours in the Geyser Box over three days and entertained (or amused) about 15,000 teachers who stopped by the Steve Spangler Science booth.
If you attended the annual NAEYC (National Association for the Education of Young Children) conference last week in Dallas, Texas, it wasn’t hard to find the Steve Spangler Science booth. All you had to do was listen for the shouts of surprise as we launched over 600 Mentos Geysers with the Geyser Tube™ in our own take on the classic dunk tank… the Boy in a Box. It was great to see the teacher reactions when they pulled the string and sent a blast of Coke raining down on our never-tiring Boys in a Box.
As my team can attest, I lost my voice at the conference… just like I do every year… from explaining to everyone who passed by the science behind the Mentos and Diet Coke reaction. It’s important as educators that we don’t just drop some Mentos in a Coke and call it science. The resulting geyser is a great effect, but you are missing the key piece of the lesson. Shoot off a geyser, then listen as your students start to ask questions… “Why does that happen?”… “What if we used more Mentos?”…
If you’ve followed us over the years, you know that NAEYC (the National Association for the Education of Young Children) is the first teacher conference where we introduced the famous Mentos Geyser Experiment. In 2006, we launched 700 geysers in the open air on the trade show floor. The Geyser Chamber made its debut in 2007 to show how the geyser shoots 30 feet in the air. This year it’s Boy in a Box… a clear plastic container measuring 4′ x 4′ x 7′ where geysers fly at the rate of 30 per hour (watch the streaming video). It’s easy to find the Steve Spangler Science booth in the NAEYC exhibit hall - just listen for the screams followed by applause.
It’s probably the most asked question we get… “How exactly does that experiment with the Mentos and Diet Coke really work?” From the outset (nearly eight years ago), we hypothesized that the exploding soda was a physical reaction, and the key factor in the release of carbon dioxide was the microscopic pits on the surface
of the chewy mint. However, there was no real scientific study that anyone could point to as the definitive answer… until now. In the June issue of the American Journal of Physics, Tonya S. Coffey, an assistant professor of physics and astronomy at Appalachian State University, in Boone, N.C., and her team of fearless physics students reported on the ingredients, temperature dependence, duration, and other parameters of the suddenly famous Mentos-Diet Coke reaction.
There has been considerable debate over gum arabic (found in the coating of the mint) and the role it plays in the physical reaction. Coffey’s group was able to confirm that the surfactant gum arabic is a key component of the reaction: It reduces surface tension, thereby
So, America throws it back to the Europeans… from Louisville, KY to Turiba University in Latvia there is a new Mentos and Diet Coke World record. On June 19th, 1,911 students from Business University Turiba in Latvia launched an amazing geyser eruption and landed themselves in the Guinness Book of World Records, just over a month after students at Male High School in Kentucky launched 1,800 simultaneous geysers to earn their own world record status. The Latvian University students were celebrating the school’s 15th anniversary, and what better way to celebrate than with Mentos and Diet Coke. Check out the video of this monumental occasion. Now, who’s next…
If you attended the annual NAEYC (National Association for the Education of Young Children) conference last week in Dallas, Texas, it wasn’t hard to find the Steve Spangler Science booth. All you had to do was listen for the shouts of surprise as we launched over 600 Mentos Geysers with the Geyser Tube™ in our own take on the classic dunk tank… 
