Volume is is inversely proportional to pressure, the volume is doubled when the pressure is halved.
According to Boyle's law, the volume of a given mass of gas is inversely proportional to its pressure at constant temperature. Mathematically;
V ∝ 1/P
Now we are told in the question that the pressure of an enclosed gas decreases to half its original value. Since the volume is is inversely proportional to pressure, the volume is doubled when the pressure is halved.
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