密度计是用来直接测量液体密度的仪器,它是利用物体浮在液面上的条件进行工作的。它的构造是一根上部标有刻度的形状特殊的玻璃管,在管的下部玻璃泡内封装小铅丸或水银,使它能竖直浮在任何液体的液面上。它的刻度有两个特征:一、刻值上小下大;二、刻度线间距离上疏下密。1、为什么密度计的刻度值上小下大呢?由于密度计受到的重力不变,根据它的工作原理,那么它在各种不同的液体里受到的浮力都相同,因此把它放在密度较大的液体中,它排开 Densitometers are instruments used to directly measure the density of liquids. They work by using the conditions of objects floating on the liquid surface. Its structure is a specially shaped glass tube with an upper scale marked on it. Small lead pellets or mercury are encapsulated in the lower glass bulb of the tube so that it can float vertically on the liquid surface of any liquid. Its scale has two characteristics: one is that the engraved value is small and the other is large; and second, the distance between the scale lines is dense and dense. 1. Why is the scale value of the densitometer smaller? Because the gravity meter is subject to constant gravity, according to its working principle, then it receives the same buoyancy in various liquids, so put it in density. In larger liquids, it displaces