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初中物理第一册在讲述“物体浮沉条件的应用”一节时,谈到了比重计并且有一幅插图,大多数学生在课后仔细阅读教材时都会提出如下的问题:①为什么比重计的刻度值越往上越小?②为什么比重计的刻度不均匀,而是上疏下密(文中的“上”和“下”都是针对比重计浸入待测液体达平衡时而言的。)下面利用初等数学知识来定量解答。
In the first volume of junior high school physics, when I talked about the application of the object floating condition, I talked about the hydrometer and had an illustration. Most students would ask the following questions when they read textbooks after class: 1 Why is the scale value of hydrometer? The smaller the scale is, the smaller the scale is? 2 Why is the scale of the hydrometer not uniform, but the upper and lower density? (The “up” and “down” in the text are for the immersion of the hydrometer into the liquid to be measured.) The following uses the elementary mathematics. Knowledge to solve quantitatively.