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初中物理第一册第五章 “液体压强的公式”一节中,液体压强公式p=ρgh是以液体有重量而产生压强为前提,在液体中取一个液柱,利用压强的知识分析,推导得出来的。得出的结论反映出液体压强与液体的重量无关,只跟液体的密度和深度有关。对于这一点学生不易理解,成为教学中的一个难点。课本上介绍了帕斯卡做的一个实验(课本图5-24)来说明这一点,而学生对这个实验的结果不易理解和接受。我们在教学中采用了下述实验进行演示,实验现象明显,效果显著。具体做法如下:取口径相同的底部具支试
In the fifth chapter of the junior high school physics “liquid pressure formula ” section, the liquid pressure formula p = ρgh is based on the premise that the liquid has a weight and the pressure, take a liquid column in the liquid, using pressure knowledge analysis Derived. The conclusions drawn reflect the fact that the liquid pressure is independent of the weight of the liquid and is only related to the density and depth of the liquid. For this, students are not easy to understand and become a difficulty in teaching. An experiment (Paper 5-24) by Pascal was introduced in the textbook to illustrate this point, and the student’s results on this experiment are not easy to understand and accept. We have used the following experiment to demonstrate in our teaching. The experiment phenomenon is obvious and the effect is significant. The specific approach is as follows: Take the same bottom of the caliber test