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电荷除空间电常。

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

我们还知道库仑常等四圆周率乘空间电常倒。

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

这等电通量随时间变化乘空间常电常。

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.

您可使用我们能量密度方程，并用电场和电常平方根时间替换磁场大小 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常方程，电场空间电常 epsilon 为零，磁场空间电常 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球体电通量等正点电荷电荷除空间电常。

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，但空间电常是我们之前使用相对论常，它将电荷与电场物理效应联系起来。

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一个组成部分，它等闭合电荷除空间电常。

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，无限大而薄电荷平面包围并引起电场强度等表面电荷密度除空间电常两倍。

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.

表示电容一种方法是将每个极板面积除它们之间距离， 这乘一个常，称为可用空间容差， epsilon 注释推断。