Activity Theme: STEAM - Science
Related Academic Fields of Study: Chemistry, Physics
Estimated Time: 10 minutes
Introduction: Students will conduct a chemistry experiment and create a colloid known as oobleck, a
non-Newtonian fluid, from scratch using household items.
Click HERE to view an example of this experiment!
Background:
A non-Newtonian fluid is a liquid whose viscosity changes depending on the pressure exerted on it. Most liquids
have a consistent viscosity, meaning they will always flow at the same rate regardless of how you pour them or
press them. On the other hand, oobleck does not have a consistent viscosity and is therefore classified as a
non-Newtonian fluid. Oobleck forms into a solid when you apply pressure, and melts into a liquid when the
pressure is loosened.
In chemistry, oobleck is considered a colloid, a substance in which the small particles of one substance are
dispersed throughout another substance, but not chemically bonded.
Materials/Special Requests: You will use four materials to create an Oobleck.
● 1 cup of water
● 1 ½ cups of corn starch
● Large bowl
● Spoon
● Food coloring (optional)
Instructions:
1. Pour the cornstarch into your large bowl.
2. Slowly add some water into the bowl and mix the ingredients together with your spoon or hand.
3. Want to make it colorful? Add a few drops of food coloring to your mixture and combine.
4. Find the perfect consistency. If your oobleck is too watery, add a little more cornstarch. If your oobleck is
too solid, add a splash of water.
5. Have fun with it! Add different amounts of pressure to the oobleck and see how it’s viscosity changes.
6. To store your oobleck, let it dry out in an open container and store once it’s dry. To reactivate it, just add
some water!
Get Creative:
● Explore how oobleck changes when subjected to different temperatures, like putting it in the freezer.
● Use bowls, baskets, colanders, bottles, and much more to create an oobleck fountain. For an example, click
HERE.
Additional Notes:
● Make sure you wash your hands before and after they are done with the experiment.
● Oobleck is not edible and should not be digested.
● Let oobleck dry for easier cleanup
● Clean up after your experiment with water and paper towels. If using disinfectant wipes, ask an adult for
assistance
● To dispose of the oobleck, mix it with a lot of hot water to make a very loose slurry. Pour a small amount
into the drain while the hot water is running. Oobleck when dried can be easily vacuumed.
To find more activities, visit www.lulac.org/steamday20.
