To make magic mud mix Table spoons of cornflour and water in the ratio of 5:2.
2007-03-26 07:25:48 · 6 answers · asked by Danny_b 1 in Science & Mathematics ➔ Chemistry
Do you really want to know? Once you know it and understand it, it's not magic anymore.
Cornstarch in water is classified as a dilant liquid in rheology. Dilant materials have the property that their viscosity increases with rate of shear. When you squeeze it, you are applying shear stress on the material at a rather substantial rate. The material responds with increased viscosity. The higher viscosity makes it appear more like a solid. However, once you stop squeezing or shaping it and just let it sit. The only forces on it is gravity. The rate of shear is very low. The material responds with lower viscosity, which allows it to flow under gravity. So it behaves like a liquid with low shear rate. The slower you stir or shape it, the more like a liquid it will behave. The faster you stir it or shape it, the more like a solid it will behave.
2007-03-26 07:54:27 · answer #1 · answered by Elisa 4 · 2⤊ 0⤋
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2016-10-20 12:01:37 · answer #2 · answered by Anonymous · 0⤊ 0⤋
It's a question of how rapidly the force is applied.
If you apply the force rapidly, you generate a structure that resembles a solid; apply the force more gradually and it behaves as liquid.
There's a good account of this behaviour at:
http://science.howstuffworks.com/body-armor.htm
Hope that helps.
2007-03-26 07:59:53 · answer #3 · answered by maximus 2 · 1⤊ 0⤋
The previous users have provided good answers. If you want to see a cool video of these principles in action, watch this youtube video:
http://youtube.com/watch?v=f2XQ97XHjVw
2007-03-26 08:26:08 · answer #4 · answered by Steven 2 · 0⤊ 0⤋
its a fixatropic liquid, that is a liquid that can act like a solid
2007-03-26 07:33:22 · answer #5 · answered by sabrina 5 · 1⤊ 1⤋
cuz its magic, silly boy!!!
2007-03-26 07:28:46 · answer #6 · answered by MnKLmT 4 · 1⤊ 2⤋