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Problem 5 - Entrance Test

A gas is compressed isothermally to half of its initial volume. If the initial pressure was P, what is the final pressure?

Correct: C

For an isothermal process, PV = constant. So, P₁V₁ = P₂V₂. If V₂ = V₁/2, then P₁V₁ = P₂(V₁/2). Thus, P₂ = 2P₁ = 2P.