密度是物质的一种特性,是初中物理中一个非常重要的物理量,是学好力学的基础.测量物质密度的方法较多,如可以利用密度计直接测量;也可以利用密度的定义、压强、浮力等知识间接测量.可见,它是一个比较综合的实验,既能考查学生的实验技能掌握 Density is a property of matter and a very important physical quantity in junior middle school physics, which is the foundation of learning mechanics.Many methods of measuring material density are available, such as direct measurement with densitometer, definition of density, pressure, buoyancy Such as indirect measurement of knowledge.It can be seen that it is a more comprehensive experiment, both to test the students to master the experimental skills