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Iso/Thixotropy

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Description: This experiment demonstrates iso- and thixo-tropy properties of certain emulsions (fluid mixtures).
Household Science for Kids: Iso/Thixotropy Cornstarch (or 'Corn flour'), water, large bowls or something that can hold a few cups of water and still be able to reach your hands inside. Place about a cup of cornstarch (aka corn flour) in a large bowl and add about a 1/4 cup of water to the cornstarch. Keep adding water until the mixture appears somewhat thicker than pancake batter. With your hands, take a handful and knead the mixture, like you would bread dough. As the mixture is agitated or squeezed, it will become firm as long as continuous kneading or pressure is exerted. As soon as the pressure stops, the 'batter' will revert to its original form and 'pour' through your fingers. Even though the cornstarch and water is a liquid, you can form the stuff into a ball if you can squeeze and knead it quickly enough. The sensation of this in the hands is unique and must be experienced to be believed. It feels great!
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