With some algebra, we find that this boils down to one half epsilon naught times the electric field squared.

用代数，我们发现这最终变成了一半 Epsilon Note 乘以电场平。

This equation simplifies down to an equation with two constants, the permittivity of free space for electric fields, epsilon naught, and the permittivity of free space for magnetic fields, mu naught.

该程简化了具有两个常数程，电场空间介电常数 epsilon 为零，磁场空间介电常数 mu。

One way to express capacitance is to divide the area of each plate by the distance between them, and multiply that by a constant – known as the permittivity of free space – denoted by epsilon naught.

表示电容一种法是将每个极板面积除以它们之间距离， 这乘以一个常数，称为可用空间容差， epsilon 注释推断。