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Homemade Oobleck

Ready to make a substance that’s not quite a liquid and not quite a solid? Oobleck is a fascinating, hands-on experiment that’s both weird and wonderful! This magical mix lets kids explore states of matter in a way they can feel.

  • Category: ** Free **

You’ll Need:

  • ⁠ ⁠2 cups cornstarch
  • ⁠ ⁠1 cup water (add more if needed)
  • ⁠ ⁠Food coloring (optional)
  • ⁠ ⁠A mixing bowl or activity tray
  • ⁠ ⁠Measuring cups
  • ⁠ ⁠Spoon (optional—hands are better!)

Let’s Make the Magic Happen!

  1. Add 2 cups of cornstarch to your bowl or activity tray.
  2. If you’d like to color your oobleck, mix a few drops of food coloring into the cup of water before combining it with the cornstarch.
  3. Slowly pour the water into the cornstarch. Stir the mixture together with your hands (it’s way more fun than using a spoon!).
  4. Adjust as needed – your oobleck should feel solid when squeezed and flow like liquid when released. If it’s too thick, add a splash more water; if it’s too runny, sprinkle in more cornstarch.

Why We Love It:

  • ⁠ ⁠Safe, simple and made with kitchen staples
  • ⁠ ⁠Feels wild and wacky—great for sensory play
  • ⁠ ⁠A perfect intro to fluid dynamics and materials science
  • ⁠ ⁠Easy to clean up—just rinse with warm water (and avoid pouring large amounts down the drain!)

What’s Happening Here?

Oobleck is a non-Newtonian fluid—this means that it behaves like both a liquid and a solid depending on how much force is applied:

  • ⁠ ⁠Apply pressure and it pushes back like a solid.
  • ⁠ ⁠Let it rest or flow through your fingers and it melts away like a liquid.

The science behind this magic lies in the cornstarch particles suspended in water—under pressure, they lock together to create temporary rigidity, and once the pressure is released, they unlock and flow freely again.

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