强电解的活度α与正、负离子的活度α_+,α_-之间满足关系式: α=α_+~(γ_+)·α_-~(γ~-)在谈到为什么要定义α_±、m_±、γ_±时,许多书中谈及的理由是,溶液是电中性的,不可能制成只有正离子或只有负离子单独存在的溶液,因此单独离子的活度及活度系数α_+、α_-、γ_+、γ_-均无法用实验测量。实验结果只能得到正、负离子并存于溶液中的平均行为. Strong electrolysis activity α and positive and negative ion activity α _ +, α_- to satisfy the relationship between: α = α_ + ~ (γ _ +) · α - (γ ~ -) In talking about why the definition of α_ ± , M_ ±, γ_ ±, many of the reasons mentioned in the book is that the solution is electrically neutral, it is impossible to make only a positive ion or anion alone exist the solution, so the activity of individual ions and activity coefficient α_ +, Α _-, γ_ +, γ_- can not be measured experimentally. The experimental results can only get the positive and negative ions co-exist in the solution of the average behavior.