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以前在一般的中学理化教科书中,比重是没有单位的。而在东北人民政府编译的高初中物理,化学教科书中,比重是附有单位克/厘米~3。北京市中等化学教师教研会在本刊十五卷一期第六,七页中曾讨论及此事,认为比重没有单位,在那种场合下,这些名词应改为重度。我们对这问题提出以下的见解,以供读者参考,并希望加以批判,指正。以前的一般理化书籍中多以:『一物体重与4℃时同体积水重之此』(或『一物体与4℃时水之密度比』)作为比重的定义。以『单位体积中的质量』作为密度的定义,而水在4℃时的密度等于1。所以由于这种定义而产生的概念是认为同一物体的比重与密度在数值上是相等的,所不同的只是比重没有单位,而密度有单位(克/厘米~3)。于是如果比重的单位也是克/厘米~3。就会被感觉得不易与密度区别。
In the past in the general high school physics textbooks, the proportion is no unit. In Northeast High People’s Government compiled high junior high school physics, chemistry textbooks, the proportion is attached to the unit g / cm ~ 3. The Beijing Teachers College for Secondary Chemistry Teaching and Research will discuss this matter in the sixth and seventh pages of the first volume of the fifteen volumes of this issue, believing that there is no unit of proportion, and in those circumstances, the terms should be changed to heavy. We have put forward the following opinions on this issue for reference of readers and hope that we can make criticisms and corrections. In the past, most general physical and chemical books mostly used the definition of “the weight of one object at the same volume of water at 4 ° C” (or “the density ratio of an object to water at 4 ° C”). The “mass in unit volume” is the definition of density, while the density of water at 4 ° C equals one. Therefore, the concept resulting from this definition is that the weight and density of the same object are numerically equal, with the exception of the unit of density and the unit of density (g / cm3). So if the proportion of the unit is grams / cm ~ 3. It will not be easy to feel the difference between density.