LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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We take U to be a function of S and V for a simple
closed system. An infinitesimal change in U that
corresponds to a reversible process is given by the
fundamental relation of differential calculus:
where the single subscript n means that the amounts
of all substances present are fixed.
Comparison of Eqs. (4.2-3) and (4.2-4) gives us two
important relations:
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