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要使学生确信大气压的存在,关键在于做好演示实验。初级中学课本《物理》第一册第123页图5-39是说明大气压存在的实验。大气压强产生对纸片向上的压力,使杯子倒置放手后纸片不会掉下,水不会流出;但学生往往不能接受,错误地认为是水粘住了纸片。为了消除学生的怀疑,可做以下的实验。
To convince students of the existence of atmospheric pressure, the key lies in doing demonstration experiments. The middle school textbook “Physics” Volume 1 Page 123 Figure 5-39 shows the experiment of atmospheric pressure. Atmospheric pressure exerts pressure on the paper upwards. When the cup is turned upside down, the paper does not fall and the water does not flow out. However, students often cannot accept it, and mistakenly believe that the water is sticking to the paper. In order to eliminate student suspicions, the following experiment can be done.