Cornstarch Slime is a favorite sensory activity and STEM experiment at our house. Luckily it’s an inexpensive experiment as well!
Non-Newtonian fluids change their viscosity or flow behavior under stress. If you apply a force to such fluids (say you hit, shake or jump on them), the sudden application of stress can cause them to get thicker and act like a solid, or in some cases it results in the opposite behavior and they may get runnier than they were before. Remove the stress (let them sit still or only move them slowly) and they will return to their earlier state.Science Learning Hub
To make cornstarch slime couldn’t be easier, simply combine a 1:2 ratio of water to cornstarch and get mixing! Have the kids experiment with applying pressure, such as hitting it in the video above. Contrast this with allowing the slime to flow easily between their fingers. Discuss how this is different from standard liquids (or Newtonian liquids.)
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