تفاوت بین [ریاضی] \ دلتا G [/ ریاضی] و [ریاضی] \ دلتا درجه ° [/ ریاضی] در ترمودینامیک چیست؟


پاسخ 1:

ΔG0describestheamountofGibbsfreeenergythatthesystemhasunderstandardconditions.[math]ΔG[/math]ismoregeneral,theGibbsfreeenergyatanytemperature.Itconsistsofthe[math]ΔG0[/math]plusanotherfactorproportionaltothelogofthepressurecomparedwiththepressureunderstandardconditions.\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.)

Thatis,whenthepressuregoesup,theincreaseinGisproportionaltothelogofthepressure,ascomparedwiththestandardpressure.Whenthepressureisthesameasstandardpressure,ΔG0=ΔGbecause[math]logpp0=log1=0[/math].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].