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Chestermiller

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Who says that this is the case for a quasi-static process? What about an isothermal quasi-static process, where dQ is not equal to zero?We know that dQ = dE + dW for any system.

However, in quasi-static processes, dW = -dE.

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In Reif's Fundamentals of Statistical and Thermal Physics, in Section 2.9 on quasi-static processes, it states that the work dW done by the system when it remains in a particular state r is defined as dW

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Chestermiller

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I don’t have a copy of that book. But, it dorsn’t sound correct to say that a system remains in a particular thermodynamic state if its internal energy changes. The equation you have written is correct only for an adiabatic change.

In Reif's Fundamentals of Statistical and Thermal Physics, in Section 2.9 on quasi-static processes, it states that the work dW done by the system when it remains in a particular state r is defined as dW_{r}= -dE_{r}. I understood this as saying that dW = -dE for quasi-static processes

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