All STEM Activities

Elephant Toothpaste

Active Time
< 10 minutes
Total Project Time
< 10 minutes
Key Concepts
Chemical reactions

Introduction

Create a giant foaming reaction and wow your friends with this classic science demonstration! With just a few simple ingredients, you can make something that looks like toothpaste being squeezed from a tube—but so big, it must be for elephants!

Credits

Ben Finio, PhD, Science Buddies
Svenja Lohner, PhD, Science Buddies
This activity is not appropriate for use as a science fair project. Good science fair projects have a stronger focus on controlling variables, taking accurate measurements, and analyzing data. To find a science fair project that is just right for you, browse our library of over 1,200 Science Fair Project Ideas or use the Topic Selection Wizard to get a personalized project recommendation.

Materials

  • Empty plastic bottle
  • Dry yeast
  • Warm water
  • Liquid dish soap
  • Liquid food coloring
  • 3% hydrogen peroxide. See the Further Exploration section for instructions on using a higher concentration of hydrogen peroxide.
  • Measuring cups and spoons
  • Safety glasses
  • Large tub or tray to catch the foam, or outdoor location to do the experiment
    Materials needed for elephant toothpaste experiment

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Active Time
< 10 minutes
Total Project Time
< 10 minutes
Key Concepts
Chemical reactions