论文部分内容阅读
根据中华人民共和国国家标准GB3100～3102—93《量和单位》,化学教科书作了相应的修订。但是,目前在使用物理量和单位及有效数字方面还存在一些不规范的现象,对这个问题应引起足够的重视。一、物理量和单位1.一些物理量和单位的改变(1)“原子量”、“分子量”分别改为“相对原子质量”和“相对分子质量”,其物理量符号分别为Ar、Mr,其单位名称均为“一”,单位符号均为“1”(单位1一般不写出)。由原“无量纲量”改为“量纲一的量”。原子量的定义“……比较所得的数值”改为“……比较所得的值”。作为过渡,现阶段仍可称呼原子量、分子量。“式量”今后将由“相对分子质量”代替,现阶段暂时还可使用。
According to the National Standards of the People’s Republic of China GB3100 ~ 3102-93 “Quantity and Unit”, the chemistry textbook has been revised accordingly. However, there are still some non-standard phenomena in the use of physical quantities and units and effective figures, and this issue should be given enough attention. First, the physical quantity and unit 1. Some physical quantities and units of change (1) “Atomic weight”, “Molecular weight” were changed to “relative atomic mass” and “relative molecular mass”, the physical signs are Ar, Mr, the unit name Both are “one” and the unit symbol is “1” (unit 1 is generally not written). From the original “dimensionless quantity” to “the quantity of dimension one”. The definition of the atomic weight “... compares the resulting value” is replaced by “... the resulting value compared”. As a transition, atomic weight and molecular weight can still be described at this stage. “Formula quantity” will be replaced by “relative molecular mass” in the future and it can be used temporarily at this stage.