Discover non-newtonian fluids (substances that act as both a liquid and a solid) and liquids that glow under black light with this messy, but delightful activity!
Have you ever hit some water with a hammer? We’re not sure why you would have, but if you can imagine doing that, you can also imagine that the hammer would make a splash as it goes right into the water. The water doesn’t really push back on the hammer. But what if it did? What if you hit the water, and it stopped the hammer?
The mixture you’re going to make in this activity does just that. Oobleck is a type of mixture called a non-Newtonian fluid. If you push hard on it (no need to use hammers for this part), it hardens up and pushes back against you. If you push lightly on the oobleck, though, it stays liquidy and your hand will easily go into it.