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1.某种物质的质量和其体积的比值,即单位体积的某种物质的质量,叫作这种物质密度.符号ρ.国际主单位为单位为千克/米3,常用单位还有克/厘米3.其数学表达式为ρ=m/V,(ρ表示密度、m表示质量、V表示体积).在国际单位制中,质量的主单位是千克,体积的主单位是立方米,于是取1立方米物质的质量作为物质的密度.对于非均匀物质则称为“平均密度”.
1. The ratio of the mass of a substance to its volume, ie, the mass of a substance of a unit volume, referred to as the density of such substance Symbol ρ. The international main unit is in kilograms per cubic meter, the common units are in grams / Cm 3. Its mathematical expression is ρ = m / V (ρ stands for density, m stands for quality and V stands for volume). In the International System of Units, the main unit of mass is kilogram and the main unit of volume is cubic meter. Take the mass of one cubic meter substance as the density of the substance, and the “average density” for the non-uniform substance.