压强对化学平衡影响的实验是高中化学平衡理论的一个重要实验。在现行的高中化学教材中，讨论压强对化学平衡的影响，一般选用注射器为反应器做NO２和N２O４混合物的平衡体系，随压强变化，其颜色改变的演示实验。作为演示实验的一个最基本的条件，就是现象明显，清晰。但是， The experiment of the effect of pressure on chemical equilibrium is an important experiment of high school chemical equilibrium theory. In the current high school chemistry textbook, the effect of pressure on the chemical balance is discussed. In general, a syringe is used as a reactor to make a balance system of NO2 and N2O4 mixture, and the color change demonstration experiment is performed with pressure change. As a basic condition for demonstration experiments, the phenomenon is clear and clear. but,