U形管是实验室中常见的仪器,因它自身的特殊结构,教师常用它来做演示实验中的显示工具,下面以浙教版科学教材为例来说明它在实验当中的应用。例如,在第三册第一章第四节“水的压强”中研究水内部压强的特点时,就是用U形管内的有色液体两液面的变化来显示液体内部压强的变化的,如图1所示,该实验效果明显,可见度大。又如,在第五册第三章第七节“电热器”中研究焦耳定律时,教材用如图2所示装置研究电流产生的热量与电流、电阻和通电时间的关 U-shaped tube is a common laboratory equipment, because of its special structure, teachers often use it as a demonstration tool in the demonstration experiment, the following Zhejiang Science Edition textbook as an example to illustrate its application in the experiment. For example, when studying the internal pressure of water in Chapter 4, Chapter 1, Section 4, “Pressure of Water”, the change of the pressure inside the liquid is shown by the change of two liquid levels of the colored liquid in the U- As shown in Figure 1, the experimental effect is obvious, visibility. In another example, the fifth book Chapter VII of the seventh chapter “heater ” in Joule’s law, the textbook with the device shown in Figure 2 study the current generated by the heat and current, resistance and power-on time off