This is one
of Paul Hewitt's favorite demos for atmospheric pressure!
A simple design that demonstrates a powerful concept: Atmospheric pressure!
It's like the mat is glued down! Use a flat lab stool and you can lift the
stool! A great way to show that suction cups stay stuck because of the
pushing force of air, not from a pulling "suction" force. Measures 10.5" x
10.5".
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