早在两千年以前,我国教育家荀子就提出教学要以“闻见”为基础,夸美纽斯也提出“先学实物,后教文字”。这足以说明演示实验的重要性。物理教科书中安排了大量的演示实验,它可以把抽象枯燥的原理具体、直观、形象地表达出来,使学生获得直观的、感性的认识,有时还会再现物理规律 As early as two thousand years ago, the educator of our country proposed that the teaching should be based on the “hearing”, and Comenius also proposed that “first learn the real thing, and later teach the word”. This is enough to demonstrate the importance of demonstration experiments. A large number of demonstration experiments are arranged in physics textbooks, which can express the abstract boring principles in a concrete, intuitive and vivid manner, allowing students to gain intuitive and perceptual knowledge, and sometimes to reproduce the laws of physics.