LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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Expansion Processes
If P is larger than P ext the system will expand against
the surroundings. If the process is not too rapid, we
can assume to a good approximation that
P(transmitted) is equal to P ext , although we cannot
assume that is equal to P. The details of the
nonuniformity of the system’s pressure are not
important, because P does not enter into the formula
for w. We can write
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