Nothing says summer like eating watermelon and nothing says kid’s science like playing in oobleck. Perhaps because it gives kids permission to get completely and totally messy in the name of science.
Oobleck is a non-newtonian fluid which means that it can be a liquid and a solid. You can pour it and you can ball it up. It’s sticky and it’s smooth. Adding watermelon to the mix turns this into an amazing sensory activity which was recommended here.
The recipe for oobleck calls for 2 parts cornstarch and 1 part water. We just substituted the water for watermelon juice. We scooped out the watermelon for our afternoon snack and ate it before we got started then used the rind as the container to play in.
Be warned that the more you play in a watermelon the juicier it becomes. (Yes I know that’s the best technical explanation I’ve got!) Add more cornstarch if the oobleck becomes too watery.
Why not have a new twist on a classic experiment for the summer? Have fun!
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