物理概念是组成物理科学知识的基本单元,是提示研究对象具有的物理属性的一种思维方式。在研究定量的物理概念时,通常用数学的方法表示该量的物理涵义及其大小。例如在学习密度的概念时,它在数值上等到于质量和体积的比值,即ρ=m/v,它是物质的物理属性,它的量度单位是kg/m~3,这就从两个 The concept of physics is the basic unit that constitutes the knowledge of physical science and is a way of thinking that suggests the physical properties possessed by the research object. When studying quantitative physical concepts, the physical meaning of the quantity and its size are usually expressed mathematically. For example, when studying the concept of density, it is numerically equal to the ratio of mass to volume, ie, ρ=m/v, which is the physical property of a substance. Its measurement unit is kg/m 3, which is from two