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由上式可以看出这类电池的E与二个溶液中有关离子的活度有关。用上式求算其电动势时,因式中有单独离子活度,所以需借助于每一溶液中γ_+=γ_-=γ_±的假定,以γ_+或γ_-作近似计算。
It can be seen from the above formula E of these batteries and two solutions related to the activity of ions. When using the formula to calculate the emf, the formula has a separate ion activity, so the need to make use of the γ _ + = γ _- = γ_ ± in each solution is assumed to γ_ + or γ_- approximate calculation.