Physics Demonstrations by Sprott Chapter 2 Heat Demo 21 Magdeburg Hemispheres
YOUR LINK HERE:
http://youtube.com/watch?v=kRaPo00QhJ8
Two hemispheres when placed together and evacuated cannot be pulled apart because of the atmospheric pressure. See book information, which includes full demonstration instructions and materials lists at http://uwpress.wisc.edu/books/5480.htm.
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