若物体的质量为 m,体积为 V,则其密度为ρ=m∥V。测定 m 和 V,就可得出ρ。m 用分析天平测定,对于 V,由于麦粒不规则无法用常规静力称衡法来测定,但利用“密度瓶”便可解决,其原理如下:取一定量的液体(如水),其密度为ρ_0,质量 If the mass of the object is m and the volume is V, the density is ρ=m∥V. Measure m and V to get ρ. m Determination by analytical balance, for V, because the irregular grain can not be determined by conventional static balance method, but can be solved by using “density bottle”, the principle is as follows: take a certain amount of liquid (such as water), Its density is ρ_0, quality