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I guess I lead a sheltered life since I didn’t know about the “cornstarch reaction“. Make sure you watch the end of the first video. The last video is cute…
“Due to its dilatant behavior, cornstarch suspended in water is not a good analog for modeling a Newtonian lower crust. However, workers have suggested that crystal-rich magmas behave in a dilatant manner (Smith, 1997; 2000), as evidenced by brittle fractures in igneous intrusions that are cross-cut by fluid flow of the same material. This implies that a cornstarch suspension could be a useful analog for modeling deformation and flow in crystal-rich magmas, and that this type of flow may be important in the modeling of all igneous intrusions as crystal content increases with time.”
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Were they really “ramping up the acceleration”? It looked and sounded like it was at a constant frequency…
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Hi CB, I “think” that the frequency is constant but the amplitude is increasing, could be wrong though.
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We do Oobleck (cornstarch and water) in preschool as well as younger ages. We discuss the unusual properties of it acting like both a solid and a liquid. It’s hard to see from the videos I saw, but the surface is shiney!! I never tried the vibration thing though. Have you tried mixing white glue and liquid starch?
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Hi Darlene,
Oobleck was a new term to me… had to look it up
http://en.wikipedia.org/wiki/Oobleck
I could see kids having lots of fun playing with this stuff! What does glue do to it when mixed in?
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I’m doing a bit of research on cornstarch and water for a kid’s chemistry book, and I saw the reference to a paper by “Smith, 1997; 2000” about using it as a model for crystal-rich magmas. Anybody know the full reference for those papers?
Also, anybody know a good expert to talk to about non-Newtonian fluids, especially cornstarch and water?
And yes, kids LOVE this stuff. My daughter is doing a small pool of it for her science fair project.
Thanks for any help/insight.
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