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To answer this question, we must consider the gas law: PV=nRT.

This is an equation of state, so it defines relationships between pressure (P), volume (v), the number of moles in a system (n), the gas constant (R) and temperature (T). Because it is an equation of state, you cannot talk about transformations, only states in certain moments. What you can do, however, is solve the equation for nR, which is conserved.

nR = PV/T

If you hold nR constant, such as you are doing when compressing or expanding gas in a cylinder, you can say that P1V1/T1 = nR = P2V2/T2.

Considering this, what would happen to P2 if you decreased P1? To balance the equation, V would have to go down.

So if you decrease the pressure of a cylinder, but hold temperature constant, the volume would have to decrease as well.

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