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An incorrect example often used to demonstrate rheopecty is cornstarch mixed with water (sometimes called oobleck), which is a very viscous, white fluid.It is a cheap and simple demonstration, which can be picked up by hand as a semi-solid, but flows easily when not under pressure.
Applying force to oobleck, by sound waves in this case, makes the non-Newtonian fluid thicken. [21] An inexpensive, non-toxic example of a non-Newtonian fluid is a suspension of starch (e.g., cornstarch/cornflour) in water, sometimes called "oobleck", "ooze", or "magic mud" (1 part of water to 1.5–2 parts of corn starch).
Corn starch mixed in water. Cornflour, cornstarch, maize starch, or corn starch (American English) is the starch derived from corn grain. [2] The starch is obtained from the endosperm of the kernel. Corn starch is a common food ingredient, often used to thicken sauces or soups, and to make corn syrup and other sugars. [3]
Oobleck may refer to: Oobleck, a non-Newtonian fluid suspension of starch in water Bartholomew and the Oobleck, a Doctor Seuss novel, after which oobleck is named;
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This can readily be seen with a mixture of cornstarch and water (sometimes called oobleck), which acts in counterintuitive ways when struck or thrown against a surface. Sand that is completely soaked with water also behaves as a dilatant material — this is the reason why when walking on wet sand, a dry area appears directly underfoot.
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However, non-Newtonian fluids are relatively common and include oobleck (which becomes stiffer when vigorously sheared) and non-drip paint (which becomes thinner when sheared). Other examples include many polymer solutions (which exhibit the Weissenberg effect), molten polymers, many solid suspensions, blood, and most highly viscous fluids.