Entalpija

Izrazi koji povezuju entalpiju i druge termodinamičke veličine:

${\displaystyle dH=dU+p\cdot dV+V\cdot dp}$ 

${\displaystyle dH=\delta Q-p\cdot dV+p\cdot dV+V\cdot dp}$ 

${\displaystyle dH=\delta Q+V\cdot dp}$ 

${\displaystyle dH=T\cdot dS+V\cdot dp}$ 

gdje je: Q - toplina, a S - entropija.

Izobarni proces (${\displaystyle p=konst.}$ ):

${\displaystyle dH=\delta Q}$ 

${\displaystyle \left({\frac {\partial H}{\partial T}}\right)_{p}=\left({\frac {\partial Q}{\partial T}}\right)_{p}=c_{p}}$  (specifični toplinski kapacitet)

${\displaystyle \Delta H=T\cdot dS\Rightarrow \left({\frac {\partial H}{\partial S}}\right)_{p}=T}$  (definicija temperature za izobarne procese)

Adijabatski proces (${\displaystyle \Delta Q=0}$ ):

${\displaystyle dH=V\cdot dp\Rightarrow \left({\frac {\partial H}{\partial p}}\right)_{Q,S}=V}$ 

${\displaystyle \Delta H=H_{2}-H_{1}=\int _{1}^{2}Vdp}$