$\Delta G^0 describes the amount of Gibbs free energy that the system has under standard conditions. [math]\Delta G[/math] is more general, the Gibbs free energy at any temperature. It consists of the [math]\Delta G^0[/math] plus another factor proportional to the log of the pressure compared with the pressure under standard conditions.$

(یا برعکس از حجم ، از آنجا که فشار و حجم در حال تعادل معکوس هستند.)

$That is, when the pressure goes up, the increase in G is proportional to the log of the pressure, as compared with the standard pressure. When the pressure is the same as standard pressure, \Delta G^0 = \Delta G because [math]\log \frac{p}{p^0}=\log 1 = 0[/math].$