Recall our original definition of enthalpy:
H = E
+ PV
Then for a change in enthalpy:
DH = D E + D(PV)If we set P constant,
then:
DH = D E + P D V
Since
qp = DE + PDV
Then
DH = qp
The change in
enthalpy, D H, is then
equal to the heat
transferred at constant pressure, qp.
Enthalpy =
Heat Transferred