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关于 U 形管压强计,某《教学参考书》中作了如下解释:“把金属盒放在液体里,液体压橡皮膜,使橡皮膜向里凹,封闭在管内的气体体积减小,压强增大,就使左边液面降低,右边液面升高。这时右边液面受到的压强仍然等于大气压,左边液面受到的压强等于液体对橡皮膜的压强,而液体对橡皮膜的压强等于大气压强与液体由于本身受到重力作用而产生的压强之和,所以两边液柱高度差产生的压强就等于液体的压强。”上面解释的核心内容是:U 形管压强计能
Regarding U-tube pressure gauges, the following “Teaching Reference Book” explains: “The metal box is placed in a liquid and the liquid is pressed against the rubber membrane to make the diaphragm concave and the volume of gas trapped inside the tube is reduced. As the pressure increases, the liquid level on the left side decreases and the liquid level rises on the right side.At this time, the pressure on the right side of the liquid surface is still equal to the atmospheric pressure. The pressure on the left side of the liquid surface is equal to the pressure of the liquid on the rubber membrane, and the pressure of the liquid on the rubber membrane It is equal to the sum of the atmospheric pressure and the pressure of the liquid due to its own gravity, so the pressure difference between the two sides of the liquid column is equal to the pressure of the liquid." The core content of the above explanation is: the U-tube pressure gauge can