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在一些初中物理教材或教辅书中讲到液体内部压强的问题时,喜欢采用盛水容器侧壁上不同高度处从小孔中喷出水流的射程这一演示实验,如图1所示,以说明“同种液体内部,深度越大,压强也越大”的结论。但实际上用这个实验来说明上述这一重要的物理规律是不合适的,因为静态液体的压强涉及到的是静力学问题,而这个演示实验则涉及到动力学问题,包括从小孔中喷出水流的初速度与该
In some junior high school physics textbooks or supplementary books, when talking about the problem of the internal pressure of the liquid, we like to use the demonstration experiment of spraying the water flow from the small holes at different heights on the side wall of the water container. This is shown in Figure 1. To illustrate “the same kind of liquid inside, the greater the depth, the greater the pressure ” conclusion. But in fact using this experiment to illustrate the above-mentioned important physical laws is inappropriate, because the pressure of static liquids involves static problems, and this demonstration experiment involves dynamic problems, including spraying from small holes. The initial speed of the water flow and the