Abstract:

The difference between ΔG and Δ_rG_m as direction criteria was briefly described. The ΔG criterion is applicable to the isothermal and isobaric processes of the closed system; however, the Δ_rG_m criterion is the further deduction of application of the ΔG criterion in chemical reaction system and represents the potential function of the reaction system at a certain time. Δ_rG_m as the direction criteria requires only W'= 0 instead of the isothermal and isobaric conditions.

Key words: ΔG criterion, Δ_rG_m criterion, The Gibbs function