For example, no matter how much a dancer wishes to leap off the floor and then start turning, the law of conservation of angular momentum absolutely prevents such a movement.
例如，无论一个舞者多么想要跳离地板，然后开始旋转，角动量守恒定律绝对阻止这样的动作。
That's a spin angular momentum.
那是旋转的角动量。
Why? Because it has angular momentum.
为什么，因为有了一个角动量。
What will the spin angular momentum do?
旋转的角动量会怎样呢？
What will the angular momentum vector do?
角动量的矢量会怎样呢？
And what does the spin angular momentum do?
旋转的角动量怎么了呢？
What is the magnitude of that angular momentum?
角动量的，数值是多少？
It describes the angular momentum of the electron.
它描述的是，电子的叫角动量。
You give it spin angular momentum, it becomes stable.
有了一个旋转的角动量，就变得稳定。
Spin angular momentum will start to chase the torque.
旋转的角动量会开始，跟随那个力。
I've changed the direction of the spin angular momentum.
我改变了旋转角动量，的方向。
Angular momentum is pointing straight at me, away from you.
角动量直接指向我，远离你们的方向。
The angular momentum change must be torque t times delta t.
角动量的改变就是,力乘以δ
Spinning this direction, angular momentum is in this direction.
这个方向旋转，角动量是，这个方向。
So spin angular momentum has the property of stabilizing things.
旋转的角动量有，稳定事物的性质。
So the torque is persuading the spin angular momentum to change.
所以力是使得旋转的角动量,改变的理由。
Somehow, it has the smell of some conservation of angular momentum.
不知怎么的，这一定律和,角动量守恒定律有所相似。
That means if there's torque, there's a change of angular momentum.
这意味着，如果那有一个力矩，就会有角动量的改变。
Bohr says that the energy is quantized through its angular momentum.
波尔说能量通过角动量，被量子化。
And now the angular momentum is rotating like this, is pointing here.
现在的角动量是像这样，转动的，指向这。
That's immediate consequence of the conservation of angular momentum.
这是角动量守恒的，立竿见影的效果。
I'm going to spin it with a high angular momentum, high spin angular momentum.
以高的角动量来旋转，高旋转的角动量。
Angular momentum is conserved about this point Q, but only about that point Q.
角动量，在点Q守恒，也只有在点Q守恒。
The angular mo... the momentum of the cluster as a whole not angular momentum, I misspoke.
有角度的动。,星云整体的动量,不是有角度动量，口误。
That makes sense to me because the torque is persuading the angular momentum to follow it.
我觉得是对的，因为力是，使得角动量跟随它的。
The spin angular momentum is now in this direction, so I'm going to give it a torque like so.
旋转的角动量现在是这个,方向的，我给它一个这样的力。
I'll give it a little bit more spin angular momentum, so now I move my left hand towards me and my...
我再给它多一点的角动量，现在我将我的左手朝我移动。
If I put it on this side, torque is now in this direction, spin angular momentum is in this direction.
在这边，力现在就是这个，方向的，旋转角动量是，这个方向的。
Now we're going to apply for the first time in systems like this, the conservation of angular momentum.
这是我们第一次，在这种系统里使用，角动量守恒定律。
Bohr expressed the quantum condition by the angular momentum, quantum condition in the following manner.
波尔阐明了他的量子理条件，通过角动量，和以下的量子条件进行量子化。
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