化学等效平衡是高中化学教学一大重点,也是一大难点。文中讲解有关恒温恒容下反应前后体积不变与体积变化,以及恒温恒压下的化学等效平衡问题。 The chemical equivalent balance is a major focus of high school chemistry teaching, and it is also a major difficulty. This article explains about the constant and volume changes before and after the reaction under constant temperature and constant temperature, as well as the chemical equivalent balance under constant temperature and constant pressure.