Question

Cecily is inflating one of her bicycle tyres with the pump below. When she pushes the plunger down, does the volume of the gas in the
cylinder increase, decrease or stay the same?

Answer 1

Answer:

See the explanation below

Explanation:

This problem can be better understood graphically, so in the attached image we will use a diagram of a positive displacement air pump.

We can see that when she pushes the plunger, we see that the volume decreases.