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对一种物质,其密度定义为ρ=m/V,是一个只与物质种类有关的物理量.对于由两种或两种以上物质所组成的混和物,我们同样也可定义混合物的等效密度
For a substance, its density is defined as ρ=m/V, which is a physical quantity related only to the type of substance. For a mixture of two or more substances, we can also define the equivalent density of the mixture.