If the volume of a sample of gas is doubled while holding the temperature of the gas constant, then the pressure of the gas is half the initial pressure.
The relationship between the volume and pressure of a gas is given by Boyle's law of gases.
The equation of Boyle's law of gases is given as follows:
P₁V₁ = P₂V₂
Where;
Solving for the final pressure of the gas;
V₂ = 2 V₁
P₂ = P₁ * V₁ / 2 V₁
P₂ = P₁ / 2
Hence, the final pressure is half the initial pressure.
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