Science Experiment
Mentos Fun

This science experiment using Mentos candy and diet coke is a classic. It is fun and can be used as an experiment or science fair project. The experiment involves dropping a piece of Mentos candy into a liter of diet Coke. It is so popular that it was featured on an episode of Myth Busters.

Science Experiment, Mentos Experiment, Photo by Myrna MartinMentos Experiment


  • Liter bottle of diet Coke or Pepsi
  • Package of Mentos candy


  1. This experiment should be done outside in an open area.
  2. Take one or two pieces of Mentos candy out of the wrapper.
  3. Open the bottle of diet coke and step back out of the way.
  4. Here are some hints to make an even bigger geyser.
  5. Use warm pop and do the experiment on a warm day.
  6. Make holes in the candies and string them together so they can all be dropped in at the same time.
  7. You can also take a piece of white pipe found in plumbing sections of a hardware store.
  8. Make sure the pipe will fit on the top of the coke bottle and the Mentos candy will slip through.
  9. The pipe should be about an inch taller than a package of Mentos candy.
  10. Make a slot in the pipe half way through that is thick enough to hold a quarter.
  11. Place a quarter in the slot and load your pipe with Mentos candy.
  12. Open the liter and pop and place the pipe over it and remove the quarter.
  13. After the candy has dropped inside step back and watch the fun.

More Links to Science Activities

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Water Cycle Experiments, Acid Rain Learn what happens when acid rain falls on objects made of calcite in this experiment.

Volcano Experiment, Volcanic Eruptions Find out what happens when expanding gases in magma cannot escape beneath a volcano.

Water Cycle Experiment, Salt on a Stick This experiment combines science and history as it shows how Indians collected salt and exchanged it for obsidian.Have fun shooting rubber bands in this fun and easy experiment.

Science Experiment, Mentos Fun Have fun creating a geyser of diet coke in this simple experiment.

Earth Science The links on this page include information on the Earth, the Rock Cycle, Volcanoes, experiments, activities and much more.


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Check out Myrna Martin's award winning textbooks, e-books, videos and rock sets.  The Kids Fun Science Bookstore covers a wide range of earth science topics.  Click here to browse. 

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