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比重是不是要有单位这一问题,的确需要有一个统一的定义了。我同意比重有单位比没有单位要好,真如李承欧、张展同志所说的,没有单位,其物理意义不够明确,苏联的比重是有单位的,它的定义很明确。所谓比重,就是单位体积物质的重量,其单位为克/立方米,苏联对密度的定义亦很明确,所谓密度,就是单位体积物质的质量,其单位为克-质量/立方米。或仟克-秒~2/米~4。后面这一单位是从牛顿第一定律演化来的。牛顿第一定律:F=mα,倘α为地心加
It is true that there needs to be a uniform definition of the issue of whether the proportion should have a unit. I agree that having a unit of proportion is better than having no unit. As Li Chengou and Zhang Zhan actually said, there is no unit and its physical meaning is not clear enough. The proportion of the Soviet Union is unitary, and its definition is very clear. The so-called proportion, is the weight per unit volume of material, the unit is grams / cubic meter, the definition of density in the Soviet Union is also very clear, the so-called density, is the mass per unit mass of material, the unit is grams - mass / cubic meter. Or thousand grams - seconds ~ 2 / m ~ 4. The latter unit evolved from Newton’s first law. Newton’s first law: F = mα, if α is geocentric plus