In this science experiment we will explore the wonders of the Mentos and Diet
Coke geyser. We will also attempt to explain why and how it works. When Mentos
and Coke mix the result is volcanic! Other carbonated soda drinks can be used
as well but Diet Coke seems to produce the best reaction. Experiment with
different types of sodas and log your results to see which makes the biggest

  • Mint Mentos (candy mints)
  • Large bottle of Diet Coke.
  • Test Tube (or some creative insertion device).

Watch Video:  Mentos and Diet Coke Geyser Experiment and Explanation

Process Mentos and Diet Coke Geyser Experiment and Explanation

1) Unwrap the Mint Mentos.
2) Put them into a tube of any sort.
3) Uncap the diet coke.
4) Dump them in and run.

Explanation Mentos and Diet Coke Experiment

When you drop the Mint Mentos candy into the Diet Coke it starts to foam and
erupt into the air. Dont use the fruit Mentos because they have a smoother
surface that will produce a small or no reaction at all. The Mentos and Diet Coke
experiment is an example of a physical reaction.

The reaction can be used to demonstrate how a Volcano or Geyser erupts. Other
people prefer to make the bottle go like a rocket by first putting the Mentos inside
the Diet Coke and then screwing the cap back on. After which they slam the bottle
into hard ground cap first. It takes off like a rocket!

There are many factors that cause the physical reaction. Ingredients contained in
the Diet Coke (Carbon Dioxide gas, benzoate, caffeine, aspartame, potassium)
and Mentos mints (gelatin and gun arabic) react when combined together.
However many scientists think the primary cause of the eruption reaction may be
attributed to the physical makeup of the Mint Mentos candy itself and the
nucleation on the surface. Nucleation on the surface of the mint Mentos is
evidenced by all of the tiny littles holes found there. These small nucleation holes
permit Carbon Dioxide bubbles to form very fast and grow rapidly when the Diet
Coke is added.  What results is a big eruption of foam.
Mentos Geyser
Mentos Geyser
Mentos Geyser
Mentos Geyser
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