- The mass of one unit of volume of a material is called its density.
物质单位体积的质量叫做密度。
- Within the remainder of the dielectric the net charge per unit volume remains zero.
在电介质的其余部分,单位体积的静电荷仍为零。
- The mass of one unit of volume of a material is called its density.
物质单位体积的质量叫做密度。
- Within the remainder of the dielectric the net charge per unit volume remains zero.
在电介质的其余部分,单位体积的静电荷仍为零。