Practice question
Question
For a reversible isothermal compression of an ideal gas, the heat absorbed is:
Explanation
For an isothermal process (Δ U = 0), Δ U = q + w = 0, so q = -w. For reversible compression, w = -nRT ln(V₂/V₁) (positive), so q = nRT ln(V₂/V₁), which is negative since V₂ < V₁.
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