law of mass action

详细解释:【化】 质量作用定律
【医】 质量作用[定]律, 分量作用[定]律, 格-瓦二氏定律

英语解释：

名词 law of mass action:

(chemistry) the law that states the following principle: the rate of a chemical reaction is directly proportional to the molecular concentrations of the reacting substances