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Re: Walking on cornstarch
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Originally Posted by Mrs. M
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I've never seen Ellen's show, but when I see any clips of it, I really do want to see it. I like her sense of humor and she seems nice and pretty clean in humor all around. I also like her self-depracating style.
And, cornstach and water is a stress-thickening fluid, one of the types of non-newtonian fluids (a fluid which has a non-constant viscosity, dependant on the external stress applied to it and are often polymers or colloidal fluids). As more external stress is applied to it, it's viscosity becomes higher. Quicksand (colloidal) and the material for Silly Putty (slightly reticulated/crosslinked polymer) are also stress-thickening fluids. But, don't try to run across quicksand.
These are not the most common types of non-newtonian fluids. More common is the opposite type, one that has a decrease in its viscosity as the amout of external stress applied to it increases. Yogurt is a good example. It's viscosity is higher when it is at rest, but when one applies stress to it, it's viscosity decreases. One can see this when they stir yogurt - it gets a bit thinner.
Still, saying it is not nearly as fun as seeing it demonstrated. Good for her for having this type of stuff on her show.
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Last edited by Si modo; 07-02-2008 at 03:53 AM.
Reason: typos
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