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notes06-07-page137 - for an isothermal process Recall the...

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for an isothermal process. Recall the de nition of Helmholtz free energy–the energy of the system available to do work. We learned previously that the maximum amount of work one can extract from the system is the work done during a reversible process. Hence dA = dw rev . For now let us limit the discussion to reversible processes. Then dS = 1 T ( dU dw rev )= 1 T ( dq rev + dw / rev dw / rev )( 1 8 . 4 ) = dq rev T . (Reversible process) Note: An alternative approach to thermodynamics which makes no reference to
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