19C heat engine
(Eq.2.37)
Path independent
Path dependent
(Eq. 3.1a) (Eq. 3.1b)
)()( reaCproCC ppp
* E is independent of P at const T.
*
PV=nRT is constant at constant Td(PV)=PdV+VdP=0PdV= -VdP
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