Volume halves.
Charles law governs the behaviour of gases.

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Ideal gases, follow the law
                   P V / T  = constant
At constant temperature : P V = constant
So if Pressure doubles, V halves ie,., becomes 1/2 of its original volume.

There is another equation for Adiabatic process (where is no energy flow between our system and environment) =>  P times Volume raised to power gamma = constant time Temperature.