Dr Vetrovec intends to perform his version of the trick at atmospheric pressure, and using permanent magnets.

维特威克博士想要在大气压力下使用永体他这种把戏。

Cerium is also used in permanent magnets for obvious applications in magnetism.

铈也用于永体，显然在学领域有明显应用。

A larger ring, called a rotor, contains permanent magnets and rotates around the stator.

一个较大环，称为转子，内含永体，并围绕定子旋转。

So why is it that permanent magnets do not do this?

那么为什么永体不会这样做呢？

This makes electromagnets quite different from permanent magnets.

这使得电体与永体有很大不同。

So let's take a look at that and compare permanent magnets to electromagnets.

让我们看一下并将永体与电体进行比较。

So now what you have created is a permanent magnet.

所以你在创一个永体。

This is different from a permanent magnet because permanent magnets don't need this wire.

这与永体不同，因为永体不需要这种电线。

And it will make a permanent magnet.

并且它会成为一个永体。

And so what is a permanent magnet?

什么永体？

Permanent magnets also have fixed poles.

永体也有固定极。

Do we have a permanent electrostatic magnet?

我们有永久静电铁吗？

On the other hand, permanent magnets are always on.

另一方面，永体始终处于开启状态。

As we increase the magnetic field it quickly, all of these dipoles align, the domains align and we have a permanent magnet.

当我们迅速增强场时，所有矩都会对齐， 畴也会对齐， 从而形成永体。

They are used in super permanent magnets and therefore on that absolutely critical instrument of economic warfare, which is called the vacuum cleaner.

它们被用于超强永体， 因此成为经济战中一个绝对关键工具，也就吸尘器。

And so if I were to change this and make it a permanent magnet, watch what happens to those domains.

所以如果我把这个变成永体，看看这些畴会发生什么变化。

But if I were to take paper clips for example, put them next to a permanent magnet the could be an induced magnet.

但以回形针为例，如果把它们放在永体旁边， 它们就可能会变成感应体。

Permanent magnets have a fixed strength, but we just talked about how we can change the strength of electromagnets, so electromagnets have adjustable strength.

永体强度固定，但我们刚才讲了如何改变电铁强度，所以电铁强度可调。

If you heat up a permanent magnet above what is called the curie temperature, all those magnetic fields get scrambled and it is not a magnet anymore.

如果你将永体加热到所谓居里温度以上，所有场就会变得混乱， 它就不再铁了。

Permanent magnets do not need a power source, but this means that we can also turn electromagnets on and off, which is pretty cool when you think about it.

永体不需要电源，但这意味着我们也可以打开和关闭电体，想想看，这真太酷了。