The scenario where volume doesn't change with changes in pressure and
temperature is when they are both doubled or tripled.
The combined gas law is shown below:
P1V1/T1 = P2V2/T2
where P1 is initial pressure, V1 is initial volume, T1 is initial temperature, P2 is
final pressure, V2 is final volume and T2 is final temperature.
If P2 and T2 is doubled , we have
P1V1/T1 = 2*P2V2/2*T2
P1V1/T1 = P2V2/T2
They are both multiplied by 2 which cancels out thereby resulting in no
change in the volume.
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