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Complete this investigation by asking your students to reflect on this
question and how their answers may have changed as a result of this investigation.
What do they know now that they did not know before?
When air presses on things it exerts a force that can hold things down.
That force can be balanced in all directions if there is air all around
the object as it was when the balsa would was on the stacked books. Air
can also hold things to a ceiling or wall when the right kind of device
is used (e.g., with suction cups).
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