LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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Work done on the system:
The signs we have used correspond to the
following convention: A positive value of w or
dw corresponds to work being done on the
system by the surroundings. A negative value of
work of dw corresponds to work being done on
the surroundings by the system.
This kind of work is sometimes called
compression work or PV work. A gas is a
simple system.
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