![]() That is why the fluid only seems to solidify if you firmly press on it. This might not be a big deal when you move the fluid slowly, but if you act on the water quickly and apply more pressure, the cornstarch particles group together. The small particles in cornstarch can’t dissolve in the amount of water you used, so they stay suspended in the liquid. This is called a Non-Newtonian Fluid because it doesn’t follow the rules Sir Isaac Newton observed in fluids like water hundreds of years ago.īut why does your fluid act this way? The secret is the cornstarch. If your mixture was successful, you will have created a fluid that briefly solidifies when pressure is applied. ![]() Then loosen your grip and open your fist. Try grabbing and holding a fistful of your fluid.Once your consistency is correct, try dragging your finger over the surface of the fluid.This liquid is a runny goo until you apply stress to it, and then it suddenly acts like a solid. Add more water or cornstarch as needed to get the right consistency (molasses or thick honey) Oobleck is a mixture of cornflour and water (similar to uncooked custard) named after a substance in a Dr Seuss book. Pressure-dependent substances, like Oobleck (and silly putty and quicksand) are non-Newtonian fluids. Moving slowly allows time for the cornstarch particles to move out of the way. When you apply force to this mixture, the mixture hardens, enough so that you can walk on a pool of it. A fast tap on the top of the Oobleck makes it feel hard, but if you dip your finger in slowly the mixture is fluid. Mix the two ingredients in a bowl with a spoon or your hands slowly. The Oobleck is a mixture of corn starch and water.Oobleck is an example of a non-Newtonian fluid. ![]() The experiment below will show you how to make a fluid that follows a unique set of physical rules! Materials Oobleck (also called magic mud) is an easy-to-make substance that has some interesting physical properties. In some fluids the viscosity increases, while in others it decreases. The water would simply flow out between your fingers. If you press, hit, or shake a non-Newtonian fluid, its viscosity changes. Fluids like water are typically hard to hold in your hand.
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