由密度的定义式ρ=m/V 可知,要测量物质的密度就必须测出物体的体积和质量.由于题目所给的条件不尽相同,这就要求我们能正确理解测量中的原理、方法,恰当地选用器材,合理地安排实验步骤,正确处理实验数据. From the definition formula of density ρ=m/V, we must measure the density of the object to measure the volume and quality of the object. Because the conditions given by the subject are not the same, this requires us to correctly understand the principle and method of measurement. , Appropriately select equipment, arrange experimental procedures reasonably, and correctly process experimental data.