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In Investigation Question 2 students saw the air pressing on water, keeping
it out of the cup. This investigation shows students that air presses
on other things, and ultimately that it presses on all things that are
in the air. Understanding this provides a building block toward developing
an understanding of air pressure. You could have groups do this, or you
may want to do it as a demonstration using student volunteers. Be sure
to try this yourself ahead of time to insure that your wood samples are
thin enough. Observe all safety precautions.
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