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新编初中物理教材,取消了“比重”概念,强调了“密度”概念。这样,一些有关的物理概念和规律也随着有所变动,这些变动在新教材中已经体现,本文就此作一些归纳整理,并提出对教材处理的浅见。一、三方面的变动1、概念自身的变动密度和比重是两个不同的物理概念,两者之间不能划等号。它们的区别和联系类似于质量和重量的关系,不同的是“比重”已被取消而代之以“密度”,而质量和重量仍并存。切莫认为只是名称的变动而已。两者的单位不同。比重的单位通常有克/厘米~3、千克/分米~3、吨/米~3三种,并且这三种单位在数值
The new junior middle school physics textbooks canceled the concept of “specific gravity” and emphasized the concept of “density”. In this way, some related physical concepts and laws have also been changed. These changes have already been reflected in the new textbooks. This article has made some summary on this issue, and put forward some suggestions on the handling of teaching materials. One or three aspects of the change 1. The concept of its own density of change and the proportion of the two different physical concepts, between the two can not be equal signs. Their difference and connection are similar to the relationship between quality and weight. The difference is that “proportion” has been removed and replaced by “density”, while quality and weight still coexist. Do not think that it is just a change of name. The unit of the two is different. The units of specific gravity are usually in grams/cm~3, kg/dm~3, tons/m~3, and these three units are