Make Your Own Stress Ball (and a Lesson in Non-Newtonian Fluids)

This is a simple, easy science project for any age, and is good for PT, hand exercise, or just for fun!

1. 6 TBSP Cornstarch
2. 4 1/2 TSP Water
3. 1 Balloon
4. Measuring Cup with a narrow spout
5. Balloon Pump
6. Measuring Spoons

Non-Newtonian fluids are fluids that ignore Sir Isaac Newton's Law of Viscosity, i.e. constant viscosity independent of stress. In non-Newtonian fluids, viscosity can change when under force to either more liquid or more solid.

Ketchup, for example, becomes runnier when shaken and is thus a non-Newtonian fluid. Many salt solutions and molten polymers are non-Newtonian fluids, as are many commonly found substances such as custard, honey, toothpaste, paint, blood, melted butter, and shampoo.

Take your balloon and blow it up with a pumper, then deflate it. Pour all the cornstarch in a large bowl, then pour 4 1/2 teaspoons of water on the cornstarch. You can do a little more, but don't make it too watery, or it will not work as well. Mix it up, then have some fun with it for a while!

Tip: Hold it in your hand without squeezing, and be amazed!

Pour it into your widened balloon, then tie it together. You now have the coolest stress ball ever!

If you want, color the water that you mix with the cornstarch. Use it in a clear balloon for fun results!

You are done!

Thank you for reading, and as always,

Merry Making from g3holliday!