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浙教版教材中的覆杯实验如图1所示,我们观察到的现象是杯倒置后杯中的水与硬纸片没有下落。该现象说明了大气压强的存在,但这个实验在教学中存在缺陷。当做完覆杯实验后纸片为什么没有落下来呢?有的学生回答:“因为纸和杯子黏住了”或“水分子有吸引力”等,如果教师直接解释这是由于大气压的作用,就会让学生觉得教师这是在自圆其说。为此,笔者对该实验进行了改进。一、实验原理在容器底部开一个小孔,并用塞子塞住。将容器
Zhejiang Teaching Edition textbook cup experiments as shown in Figure 1, we observed the phenomenon of cup inverted cup water and cardboard did not fall. This phenomenon illustrates the existence of atmospheric pressure, but this experiment is flawed in teaching. Why did not the paper drop when the cup was over? Some students replied: “Because the paper and the cup are sticking” or “The water molecule is attractive.” If the teacher directly explains that this is due to atmospheric pressure The role of teachers will let students think it is justified. To this end, the author made improvements to the experiment. First, the experimental principle Open a small hole in the bottom of the container, and stuffed with a plug. The container