LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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If the objects are very large compared with the
system and if they have large thermal conductivities,
they will have nearly uniform and constant
temperatures, and we can treat them as though they
operate reversibly. After an induction period the
system will come to a steady state with a temperature
that depends on position but not on time, as depicted
in Figure 3.9b. Consider a period of time ∆t during
which a quantity of heat q passes through the bar.
Since the bar is in a steady state the amount of heat
entering one end of the bar is equal to the amount of
heat leaving the other end. The entropy change of
object 1 is
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