Diet Coke and Mentos: Explosive Combination or Myth?

The Science Behind the Reaction

Have you ever heard of Diet Coke and Mentos? The combination of these two seemingly harmless items has caused a stir on the internet, with videos showing explosive reactions with fountains of soda shooting into the air. But is it a legitimate scientific phenomenon or an urban myth? In this article, we will take a closer look at the science behind the reaction and demystify this popular experiment.

The History of Diet Coke and Mentos

The first documented experiment with Diet Coke and Mentos happened in 1999 by a physics teacher named Lee Marek, who wanted to demonstrate the process of nucleation using candies and soda. The reaction between Mentos and soda was discovered by accident, but the video of the experiment quickly went viral and sparked a worldwide craze. Even though the experiment is not new, it still attracts a lot of attention today, and many people are still curious about the science behind the reaction.

How Does It Work?

The reaction between Diet Coke and Mentos is a physical process called nucleation. Nucleation happens when tiny bubbles of carbon dioxide gas are released from the soda, forming a cascade of foam that shoots out of the bottle. The Mentos act as a catalyst, providing a surface area for the bubbles to form and releasing the gas more quickly. The reaction is fast-paced and explosive, resulting in a fizzy and refreshing fountain of soda.

Why Does It Happen?

The reaction between Diet Coke and Mentos happens because of several factors. First, the surface of Mentos candy is very rough, which provides a lot of space for the carbon dioxide gas to form bubbles. Second, the ingredients in Mentos, including gum arabic and gelatin, lower the surface tension of the soda, making it easier for the gas to escape. Third, the structure of Mentos creates a lot of nucleation sites, which are perfect for triggering the reaction.

What Are the Ingredients in Diet Coke and Mentos?

Diet Coke Mentos
Carbonated water Sugar
High-fructose corn syrup Corn syrup
Caramel color Modified corn starch
Phosphoric acid Flavorings
Natural flavors Hydrogenated coconut oil
Caffeine Lecithin
Aspartame Gum arabic
Acesulfame potassium Colorings
Phenylalanine Beeswax

FAQs About Diet Coke and Mentos

1. Is the Reaction Dangerous?

No, the reaction between Diet Coke and Mentos is not dangerous. It is a safe and fun experiment that can be done at home or in a classroom with adult supervision.

2. Can You Use Regular Coke Instead of Diet Coke?

Yes, you can use regular Coke instead of Diet Coke, but the reaction will not be as explosive. This is because regular Coke contains more sugar, which makes the reaction slower and less dramatic.

3. How Many Mentos Do You Need to Use?

The number of Mentos needed for the reaction depends on the size of the bottle and the desired effect. A general rule of thumb is to use six to eight Mentos for a 2-liter bottle.

4. Why Does the Reaction Produce Foam?

The reaction produces foam because the carbon dioxide gas released from the soda forms tiny bubbles when it comes into contact with the rough surface of the Mentos. The surface of the candy provides a lot of space for the gas to escape, resulting in a cascade of foam.

5. What Happens If You Swallow Mentos?

Swallowing Mentos is not recommended as it can cause choking and other health problems. Mentos candy is not designed to be ingested and can be harmful if not used properly.

6. Can You Drink the Soda After the Reaction?

Drinking the soda after the reaction is not recommended as it will be contaminated with Mentos pieces and may not be safe to consume.

7. Can You Use Mentos Gum Instead of Mentos Candy?

Yes, you can use Mentos gum instead of Mentos candy, but the reaction will not be as strong. This is because Mentos gum contains fewer ingredients that trigger the nucleation process.

8. How Far Can the Fountain of Soda Shoot?

The height of the soda fountain depends on the size of the bottle and the number of Mentos used. In general, the fountain can shoot up to 20 feet or more.

9. Can You Use Other Candies Instead of Mentos?

The reaction between soda and candy is a popular experiment, and many people have tried using different types of candy. However, Mentos are the most effective at triggering the reaction due to their rough surface and ingredients.

10. Can You Use Other Carbonated Beverages Instead of Coke?

Yes, you can use other carbonated beverages instead of Coke. The reaction will occur with any carbonated beverage that contains carbon dioxide gas.

11. What Is the Best Way to Do the Experiment?

The best way to do the experiment is to use a clean bottle of Diet Coke and a fresh pack of Mentos. It is also recommended to perform the experiment outdoors, wear safety goggles, and stand at a safe distance from the fountain of soda.

12. How Can You Make the Reaction More Colorful?

The reaction can be made more colorful by adding food coloring to the soda before the experiment. This will create a colorful and fizzy fountain of soda.

13. Is the Reaction Harmful to the Environment?

The reaction between Diet Coke and Mentos is not harmful to the environment as it does not produce any toxic substances. However, it is recommended to dispose of the soda and Mentos properly after the experiment.


Diet Coke and Mentos are two common items found in any grocery store, and the combination of these two items has resulted in a popular experiment that has been trending on the internet for years. The reaction between Diet Coke and Mentos is a perfect example of how science can be fun and exciting. Although the experiment is not dangerous, it is recommended to perform it with adult supervision and to dispose of the soda and Mentos properly after the experiment. We hope this article has shed some light on the science behind the reaction and inspired you to try it out for yourself.

Take Action Now!

If you want to try the Diet Coke and Mentos experiment at home, make sure to follow the safety guidelines and have fun! Share your experience with us in the comments section below.

Closing Disclaimer

The information provided in this article is for educational purposes only and should not be used as a substitute for professional advice. The authors and publishers of this article are not liable for any damages or injuries that may result from the use or application of this information.

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