“密度的测量”是中考命题的热点,甚至有时会成为中考压轴题.对此知识点的一般命题思路是:考查学生是否能利用公式ρ=m/V,分别找出该物质的质量m及对应的体积V,往往也伴随着一些基本仪器(天平、量筒等)使用方法的考查.为了有一定的区分度,试题一般会在“质量m”或“体积V”上设置一些障碍(有时会跳过密度的定义式,结合浮力知识测物体的密度),让学生去辨别、理清,跳出命题者设置的障碍,准确测出被测物质的 “The measurement of density ” is the hot spot of the test in the senior high school entrance examination, and even sometimes becomes the test of the senior high school entrance examination.The general proposition of this point of knowledge is to examine whether the student can use the formula ρ = m / V to find out the mass of the substance m and the corresponding volume V, often accompanied by some of the basic instruments (balance, measuring cylinder, etc.) to use the method of test. In order to have a certain degree of discrimination, the test questions will usually be in the “quality m” or “volume V” Set some obstacles (sometimes skipping the definition of density, combined with the knowledge of buoyancy knowledge of the density of the object), so that students can identify, sort out, out of the obstacles set by the proponent to accurately measure the test substance