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一、设计原理如图(一)所示,将重量为 G,密度为ρ的物体,挂在弹簧秤下浸没于密度为ρ_液的液体中,弹簧秤的示数为 G′.则物体的质量 m=G/g,物体的体积 V=G/ρg=V_排,ρ_液=F_浮/gV_排=(G-G′)/G·ρρ_液/ρ=1-G′/G.当 G=1牛,ρ=ρ_水=1克/厘米~3时,ρ_液=1-G′Δρ_液=ΔG′由此式可看出 G′均匀变化时,ρ_液也同样均匀变化,而且二者变化量相等.因此,弹簧秤可就其原有的刻度根据ρ_液=1-G′改制成密度值,制成一个具有能测密
First, the design principle shown in Figure (a) shows, the weight of G, the density of p objects, hanging under the spring balance immersed in the density of ρ_ liquid, the spring scale of the number of G’. The quality of the object m=G/g, volume of the object V=G/ρg=V_row, ρ_liquid=F_float/gV_row=(GG′)/G·ρρ_liquid/ρ=1-G′/G When G=1 bovine and ρ=ρ_water=1 g/cm-3, ρ_liquid=1−G′Δρ_liquid=ΔG′. From this formula, it can be seen that when G′ changes uniformly, ρ_liquid It also changes evenly, and the amount of change between them is equal. Therefore, the spring scale can be changed to density according to its original scale according to ρ_liquid=1-G′ to make it have a measure of density.