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在学习托里拆利实验时,老师说是大气压支持了760mm高的水银柱,小敏一时难以理解,老师这样给她解释:“当管内外水银液面的高度差约为760mm时,水银停止下降,此时液柱处于静止状态。我们应该从平衡力的角度来理解,选取如图1玻璃管内的小液面S为研究对象,由于管内水银柱上方视为真空,所以S上表面的压强是760mm高的水银柱产生的;而下表面的压强可以根据液体内部压强的特点来理解,管内外水银属于同种液体,同一深度,液体向各个方向的压强都相
When learning Tori’s experiment, the teacher said that atmospheric pressure supports a 760-mm-tall mercury column, and Xiaomin is hard to understand for a moment. The teacher explained to her this: ”When the height difference between the inside and outside of the mercury is about 760mm, Stop falling, the liquid column at rest.We should understand from the perspective of balance, as shown in Figure 1, a small glass tube S as the research object, because the tube above the mercury as a vacuum, so the upper surface of the S Pressure is 760mm high mercury column generated; and the pressure on the lower surface can be based on the pressure inside the liquid to understand the characteristics of the same type of liquid inside and outside the tube, the same depth, the liquid pressure in all directions are phase