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.
Scanning electron microscope images show the roughness of mint Mentos top and bottom left and fruit Mentos top and bottom right , the scale bars representing lengths from 20 to micrometres. The startling reaction between Diet Coke and Mentos sweets, made famous in thousands of YouTube videos, finally has a scientific explanation. Theories abound as to why this happens, with some bloggers speculating that it is an acid-base reaction because Coke is acidic. Experiments in a edition of the Discovery Channel programme Mythbusters suggested the chemicals responsible for the reaction are gum arabic and gelatine in the sweets, and caffeine, potassium benzoate and aspartame in the Coke.
But there have been no rigorous scientific studies of the reaction until now. What to expect. Bubbles will form on the straw and very quickly and completely cover the pipe cleaner. What's happening in there? Why do the bubbles form on the different things you put in the soda? The carbon dioxide molecules collect on these places and form bubbles which rise to the surface. Make a Mentos-and-Soda Fountain! First, make a tube for the Mentos. Cut a piece of paper so that it is as wide as a roll of Mentos.
Open the pack of Mentos and place all of them in the tube. Tape the tube together on the side. Make sure that the bottle is on a level surface and stably standing straight. Why do you think all of this is important? Line up where the opening of the bottle is with the opening of your cartridge. Quickly pull out the flat index card, releasing the Mentos candies into the bottle. Then step back without tipping the bottle over or disturbing the reaction.
About how high did the eruption go? How much cola is left in the bottle? As with the first bottle, remove the cap and place the flat index card on top, covering the hole. Put on your eye protection and start the video camera. Quickly pull out the flat index card, releasing the crushed Mentos into the bottle, then step back without tipping the bottle over or disturbing the reaction.
How high did the eruption appear to go? How much liquid is left in the bottle? Is it more or less than the amount that was left when you used whole candies?
If you videotaped the reactions, you can watch your videos now. What do you notice from the videos? Use a tape measure and blue painter's tape to mark off the height from the top of the bottle in meters.
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