考点聚焦质量、密度是常用的物理量,主要内容有:理解质量的概念及其特性;掌握密度的概念,会用公式ρ=m/V及其变式耐=ρV、V=m/ρ确切理解密度是物质的特性;会测量质量、体积和密度,能灵活运用密度知识解决实际问题.例1中国赠送给联合国的“世纪宝鼎”质量是1.6吨,由中国运抵联合国总部,其质量将——.(选“变大”、“不变”或“变小”)解析质量是物体中含有物质的多少,是物体的一种基本属性,它不随物体的形状、状态、位置、温度的改变而改变,所以应 Test centers focus on quality, density is a common physical quantity, the main contents are: to understand the concept of quality and its characteristics; grasp the concept of density, will use the formula ρ = m / V and its variants resistance = ρV, V = m / ρ exact understanding Density is a material property; quality, volume and density can be measured, and density knowledge can be used to solve practical problems. Example 1 The quality of “Century Baoding” presented to the United Nations in China is 1.6 tons, which is delivered by China to the UN headquarters. Its Quality will - (choose “change ” or “smaller ”) Parse quality is the amount of material in the object, is a basic attribute of the object, it does not change with the object Shape, state, location, temperature change and change, so should