Liquide Non Newtonian Explication Essay

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  • When you make this amazing ooey, gooey gloop, you’re guaranteed to hear squeals and “ooohs & ahhhs” coming from everyone playing with it! Using only cornstarch and water, this amazing mixture behaves like a solid one instant and a liquid the next. A little bit of pressure changes everything! By the end of the experience, you’ll have your hands on, in, and all over this wonderful solid-liquid (or is it a liquid-solid?) goo.

    How Does It Work

    This goo is an example of what’s called a non-Newtonian fluid – a fluid that ignores Sir Isaac Newton’s Law of Viscosity. All fluids have a property known as viscosity which is the measurable “gooeyness” of the fluid or its resistance to flowing. Honey and ketchup are liquids that have a high viscosity or resistance to flowing. Water has a low viscosity.

    Newton stated that the viscosity of a fluid can be changed only by altering the fluid’s temperature. For example,  honey flows easily (low viscosity) when you warm it but becomes very thick (highly viscous) when it gets cold. A non-Newtonian fluid doesn’t have the same dependence on temperature because its viscosity changes when stress or a force, not heat, is applied. When you squeeze a handful of the glop you made, the particles of cornstarch come closer together and trap the water between them. Its viscosity increases and it acts like a solid… for a split second. When you release the pressure, water fills the spaces between cornstarch particles again and the glop behaves like a liquid.

    Take It Further

    Not surprisingly, when you get a handle on the perfect consistency, there are several cool activities that use the glop for research. See where your creative science-mind will take you! Check out these Spangler Science links:

    1. Cornstarch Science – Quicksand Goo This includes instruction by Steve and Jack Spangler, an explanation of quicksand, and how to mix 2500 pounds (1134k) of cornstarch goo in a cement mixer truck.
    2. Cornstarch Monsters – Science Fair Project, Sick Science #055 Cornstarch goo takes on some strange shapes when sound waves are applied in a controlled way. Project variables are suggested.
    3. Cornstarch Monsters – Science Fair Project by Jack Spangler Jack shares the details of a science fair project he submitted. Even if his subject isn’t of interest to you, this is a great one watch to discover the thought process and steps involved in a winning project.
    4. Electric Cornstarch, Sick Science #194 Static electricity and your non-Newtonian fluid combine for an amazing, hands-on, non-water based activity.

    If you’d like to dig a little, the original cornstarch glop was discovered in 1949 by a young researcher named Bartholomew. A writer named Dr. Seuss tells his story in a book titled Bartholomew and the Oobleck. You might as well get the historical facts about the goo you made.

    Safety Information

    Strangely, the mixture will not stay mixed indefinitely. Over time, the grains of cornstarch will separate from the water, sink, and form a solid clump at the bottom of the bag. It’s for this reason that you must not pour the mixture down the drain even with adding lots of water. The mixture will settle in pipe traps, harden, and clog the pipes completely! Keep the mixture in a zipper-lock bag and simply toss it into the trash when you’re finished with it.

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