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Show that the isothermal work may also be expressed as W = `nRTln(P_i/P_f)`
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In the usual notation,
W = `nRT ln V_f/V_i` and Pi Vi = Pf Vf = nRT in an isothermal process
∴ `V_f/V_i = P_i/P_f`
and W = `nRT ln P_i/P_f`
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