做好演示实验,既能使学生深刻理解物理概念和规律是怎样在实验基础上建立起来的,又能使学生掌握一定的实验技能和技巧。这在初中物理教学中,尤其显得重要。为此,我在课堂演示时,比较重视演示的显明性,尽量让学生观察清楚、准确。我的做法如下: 1、突出演示实验的本质因素。在讲气体体积与压强关系时,一般是采用打气筒或抽气机来演示分析说明的,但是,这些演示不但不明显,而且对气体的“一定量”的问题也是很难说明。我采用小孩玩的竹哨子上的吹气小球,充好气,扎紧口,使其具有一定的体积。然后,放入钟罩式抽气机,抽 Good demonstration experiments, both to enable students to deeply understand the concept of physics and how the law was established on the basis of the experiment, but also enable students to master a certain amount of experimental skills and skills. This is particularly important in junior high school physics teaching. To this end, I am in the classroom presentation, more emphasis on demonstrating the obvious, try to make students observe clearly and accurately. My approach is as follows: 1, highlighting the essential factors of experimental demonstration. When talking about the relation between gas volume and pressure, it is usually to use the pump or the aspirator to demonstrate the analysis and explanation. However, these demonstrations are not only not obvious, but also difficult to explain the “certain amount” of gas. I use the child to play the bamboo whistle on the inflatable ball, filled with gas, tie tight mouth, so that it has a certain size. Then, into the bell-type suction machine, pumping