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September 23, 2015

The amazing transformation from liquid to solid

oobleck
Amazing transformation from liquid to solid
Today in science we discussed the difference between: solid, liquid, gas, and plasma.  We also learned about amorphous.  Amorphous is the state where an object is not really a liquid or solid. It's in between.  An example of this is glass and while we don't think of glass as being amorphous it really is and that's why windows that are REALLY, really old are thinner at the top and thicker at the bottom. The glass after several years (hundreds) will slowly shift to the bottom. The glass in your windows at home are doing this now, but -- you really can't see it.

One thing you can do, at home, to help illustrate this point even though it's NOT a true amorphous solid (it's a non-newtonian fluid) is to make oobleck.  Oobleck is made with two common household ingredients: water and corn starch and get its name form the Dr Suess' book Bartholomew and the Oobleck.


Oobleck is about 1 part corn starch to about 1.5/2 parts water, meaning if you use 1 cup corn starch you will want use about 1.5 to 2 cups water. If you use 3 cups corn starch you will want to use 4.5 to 6 cups water. This is a fun thing for even your teens to play with!!!




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