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Oobleck non newtonian fluid7/28/2023 But, when the pressure is removed, it flows faster and behaves like a liquid. ( 3:27) So your oobleck flows at a much slower rate when pressure is applied to it, acting like a solid. But Non-Newtownian fluids or "non-normal" fluids flow at a different rate depending on how much force or pressure is applied to them. And Newtonian fluids or "normal fluids" flow at a consistent rate. ( 3:10) All fluids have a property known as viscosity, which is basically the rate at which a fluid flows. But, when you unclench your fists and release the pressure it will slide between your fingers, like a liquid. When you squeeze it, it will form a solid ball in your palm. ( 2:58) Now grab some of this goo in your hand. Keep stirring until the mixture feels kind of like honey. Pour the cornstarch into your bowl and slowly add some water. ( 2:45) All you need is about one and a half cups of cornstarch, about one cup of water a big bowl, and a spoon. Our oobleck is a Non-Newtonian substance with a pretty simple recipe. But the stuff we're talking about is real. ( 2:33) That's where oobleck, the stuff that we're going to play with today, gets its name. You know the guy who wrote The Cat in the Hat? In another book he wrote called Bartholomew and the Oobleck there's a king who gets bored with normal, everyday weather so instead he makes sticky stuff fall from the sky. ( 2:18) Believe it or not, I didn't make this word up. Want to find Crash Course elsewhere on the internet?Ĭinematographer & Director: Michael Aranda The explanation for the strange behaviour of Oobleck lies in the shape of cornstarch particles, which are long and thin. If you apply a force to it by smacking or squeezing it this fluid will become a solid. Make observations and measurements to identify materials based on their properties. For this reason oobleck is known as a non-Newtonian Fluid. In this episode of Crash Course Kids, we'll talk about some weird stuff that's still. Ever heard of Oobleck? How about non-Newtonian fluids? Well, today Sabrina is going to show us that things can sometimes behave like a solid, and sometimes like a liquid depending on how much force is applied to them.
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