And that  all still equals the charge inside the Gaussian surface divided by the permittivity of free space.

而这一切仍然等高斯表面内的电荷除以自由空间的介电。

We also know the Coulomb constant equals the  inverse of the quantity four pi times the permittivity of free space.

我们还知道库等四圆周率乘以自由空间介电的倒。

And that is equal to the change in electric flux over time, multiplied by the permittivity of free space constant.

这等电通量随时间的变化乘以自由空间的介电。

You can take our energy density equation and substitute the magnetic field magnitude, B, with the electric field, times the square root of the permittivity constants.

以使用我们的能量密度方程，并用电场和介电的平方根时间替换磁场的大小 B。

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.

该方程简化了具有两个的方程，电场的自由空间介电 epsilon 为零，磁场的自由空间介电 mu。

The electric flux which passes through a sphere which is  concentric to a positive point charge equals the charge of the positive point charge  divided by the permittivity of free space.

穿过与正点电荷同心的球体的电通量等正点电荷的电荷除以自由空间的介电。

I won't blame you if you don't remember, but the permittivity of free space is a constant of proportionally we've used before, that relates electric charge to the physical effect of electric fields.

如果你不提我不会怪你，但自由空间介电是我们之前使用的相对论，它将电荷与电场的物效应联系起来。

Mathematically, this equation says that electric flux is the integral of the electric field over the area of the surface, which is equal to the enclosed charge, divided by the permittivity of free space.

在学上，这个方程表明电通量是表面积上电场的一个组成部分，它等闭合电荷除以自由空间的介电。

And we get that the magnitude of the electric  field which surrounds and is caused by an infinitely large, thin plane of charges  equals surface charge density divided by the quantity two times permittivity of free space.

我们发现，由无限大而薄的电荷平面包围并引起的电场强度等表面电荷密度除以自由空间介电的两倍。

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.

表示电容的一种方法是将每个极板的面积除以它们之间的距离， 这乘以一个，称为用空间容差，由 epsilon 注释推断。