Hon Chemistry 09-09-09 SI Measurements
HON CHEMISTRY – Hey guys, great job on the Oobleck lab! Ever heard of a non-Newtonian fluid? Well now you have! I posted the YouTube video clip that I showed in class today in the VodPod below. Scroll down to the bottom right and you should see it in the VodPod collection of videos. Anywho, here’s the lecture from Wednesday on the intro to SI measurements. As before, I’m sure it’s mostly review from your physical science days, but it’s a great opportunity to refresh what you’ve learned and to get ready to begin using it! We’ll do derived units tomorrow.
September 10th, 2009 at 9:22 PM
ms. skinner, just curious — are there any other examples of non-newtonian fluids — or is cornstarch and water the only one? when i was in elementary school, we went as a home-schoolers’ group to a lab and did some experiments, and the corn starch and water lab was one of them. the lady told us that it was a solid and liquid at the same time. i know she was speaking to elementary srudents, but in a sense, is that true? or does it stay a liquid even when it behaves like a solid?
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Ms. Skinner Reply:
September 10th, 2009 at 10:25 PM
Hi Katie – what would you call quicksand, ketchup, yogurt, for example? They are also examples of some non-Newtonian fluids, of a sort. Why don’t you Google it and see what you kind find. Here a link to start that has a really good explanation – http://antoine.frostburg.edu/chem/senese/101/liquids/faq/non-newtonian.shtml
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September 16th, 2009 at 8:23 PM
so, it’s still a fluid even whenever it feels like a solid… it’s the resistance of the layers against eachother that makes it feel that way. gravy, ketchup, etc., are non-newtonian fluids too, but their resistance isn’t as great as that of cornstarch solution, so they don’t behave so much like a solid. i guess quicksand is really the closest one to “oobleck.” i think i understand… it’s still confusing to my senses when i see the cornstarch solution acting like a liquid and feel a powdery solid when i move it with my fingers! very interisting… thanks for the link!
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Ms. Skinner Reply:
September 16th, 2009 at 8:43 PM
Katie – Good job!!
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