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如图为初二课本图5—18所示的压强计。应用这个压强计,可以证实液体内部存在压强,研究液体内部的压强与深度的关系以及在液体内部同一深度向各个方向的压强是否相等等问题。但是这里要注意两个问题; 一、图5—18压强计能否直接测液体的压强? 我们认为U形管两边液柱高度差产生的压强并不等于液体对橡皮膜的压强。因为液体对橡皮膜产生作用时,橡皮膜发生形变而产生弹力,这个弹力的方向跟液体对橡皮膜的压力方向机反,因此,通过橡皮膜并经封闭空气传递到U形玻璃管左边液面
As shown in Figure two for the first two textbooks shown in Figure 5-18. Using this gauge, it is possible to confirm the existence of pressure inside the liquid, to study the relationship between the pressure inside the liquid and the depth, and whether the pressure in the same depth in all directions in the liquid is equal to each other. However, we should pay attention to two issues here: 1. Can the pressure gauge directly measure the pressure of the liquid? We think that the pressure generated by the liquid column height difference on both sides of the U-shaped pipe is not equal to the pressure of the liquid on the rubber membrane. Because the liquid rubber membrane effect, the deformation of the rubber membrane to produce elastic force, the direction of this elastic with liquid pressure on the rubber membrane machine direction, therefore, through the rubber membrane and closed by the air to the left U-shaped glass surface