A student places his thumb firmly on the outlet of a bicycle pump, to stop the air coming out.
What happens to the pressure and what happens to the volume of the trapped air as the pump handle is pushed in?
1 )
pressure:decreases / volume:decreases
2 )
pressure:decreases / volume:remains the same
pressure:increases / volume:decreases
4 )
pressure:increases / volume:remains the same
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