Posted by joanna on Thursday, March 8, 2012 at 7:22am.
You must have meant "..until its pressure is reduce to exactly half its original VALUE". Pressure cannot equal volume. They have different dimensions.
(1) P*V = constant
V2/V1 = P1/P2 = 2
(2) P*V^5/3 = constant (for a monatomic gas)
(V2/V1)^(5/3) = P1/P2 = 2
V2/V1 = 2^(3/5) = 1.5157
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