密度计的刻度值和刻度位置是非线性关系,比较难于解释。不少学者,从不同角度进行了不同程度的分析,但是其中仍有不妥之处,一是没有能够把问题解释清楚,二是采用的方法也不适合初中学生的认知水平。为此,对密度计刻度特点从数学角度进行了比较深入的分析,也提供了比较便于学生理解的简易方法。 Density meter scale and scale position is a non-linear relationship, more difficult to explain. Many scholars conducted different degrees of analysis from different perspectives, but there are still some problems. One is that they can not explain the problems clearly and the other is not suitable for junior middle school students’ cognitive level. Therefore, a more in-depth analysis of the characteristics of the scale of the density meter from a mathematical point of view, but also provides a more easy way for students to understand.