A friend was telling me about the University of Virginia's Physics Day event she and her family had attended, and mentioned a cool experiment that demonstrated (you've really got to watch this video!) how a non-Newtonian fluid behaves. We have been using a really great book called "The Ultimate Book of Kid Concoctions," by John Thomas and Danita Pagel, for about 7 years now. There's a wonderfully easy recipe on page 19, called "Magic Muck." It's a great way to demonstrate the same thing at home. Here it is:
- Mix 3/4 cup cornstarch with 5-7 drops food coloring [you can skip the color]
- Slowly add cornstarch to 1/3 cup water and food coloring mixture. Do not stir!
- Let the mixture stand for 2-3 minutes.
- Pick up a handful of Magic Muck and squeeze it until it forms a hard ball. Open your hand and the Magic Muck will turn from a solid ball back into a liquid.
That's it! It's fun to play with, and makes a great mess if you fling it around. Enjoy!
UPDATE: 10/29/2007--I've received so many hits to my blog for folks searching for this recipe! Please, if you try it, come back and leave a comment--did it work? Did you change anything? What other fun stuff did you try? Thanks!