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So, remember when we talk about Coulomb force, what's holding the nucleus and the electron together, there's 2 things we need to think about.
还记得我们在讨论库仑力的时候，提到是什么将原子核与电子束缚在一起时，有两点需要考虑。
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We know what an electric field is, it's just a space through which a Coulomb force operates.
我们知道，电场不过,是库仑力的作用空间。
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Coulomb's law says the negative will be attracted to the positive, and the atom will collapse.
库仑定律说,负电荷会被吸引到正电荷上来，原子会坍塌。
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Coulomb discovered the Coulomb's law, which is a repulsion between charges.
后来库仑发现了库仑定律,才知道这是电荷之间的排斥作用
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And you will form a crystal of sodium chloride as a result of this need to form crystal expressed through the Coulomb's Law.
你能得到氯化钠晶体,因此，形成晶体所需要的条件,在库伦定律中通篇都有表达。
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So, if we think about the force that occurs between a positively and a negatively charged particle, what we have is essentially a Coulomb force, so we can describe this as a force of attraction.
一个带负电的粒子之间，的作用力,这本质上就是库伦力，我们可以把它，描述成一个引力。
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If I multiply these two, what is the coulomb times a volt?
如果我把这两个乘起来，库仑乘以伏特是多少？
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PROFESSOR: And this is a question based on where we left off on Wednesday -- we were talking about Coulomb's force law to describe the interaction between two particles and good job, most of you got this correct.
教授：这是我们上次最后,留下的问题-我们讲到,描述粒子间相互作用的,库伦定律，很好,大部分人都做对了。
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What is the unit of charge in SI? Coulomb.
国际单位制中的电荷单位是什么，库仑。
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It plays a big role in gravitation, in the Coulomb interaction.
它在引力和库仑力中都起着重要的作用
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I just plug into the Coulomb's Law.
这时再引入库仑定律。
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We can use the Coulomb force law to explain this where we can describe the force as a function of r.
我们用库伦定律解释它,力作为距离r的函数,让我们考虑一下。
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Let's look at the energetics of Coulomb's Law.
我们来看看库伦定律中的热力学知识。
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So, let's think qualitatively for a second about what that means or what the real meaning of that is. What that is telling us is that according to Newtonian mechanics and Coulomb's force law, is that the electron should actually plummet into the nucleus in 0.1 nanoseconds.
让我们定性的想想,这意味着什么,这告诉我们,根据牛顿力学,和库仑定律，电子,在0。1纳秒内,就会掉到原子核里面。
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So, we can use Coulomb's force law to think and it does that, it tells us the force is a function of that distance. But what it does not tell us, which if we're trying to describe an atom we really want to know, is what happens to the distance as time passes?
来考虑这两个粒子之间的,它告诉我们力随距离的函数关系,但它不能告诉我们，而我们如果要描述,原子又非常想知道的是,距离随时间的变化时怎样的？
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So, just, if you can take what I'm saying for a moment right now that in fact this should collapse in this very small time frame, we have to see that there's a problem with one of these two things, either the Coulomb force law or Newtonian mechanics. So, what do you guys think is probably the issue here?
所以如果你们考虑我,开始说的这个塌缩应该,发生在很短的时间里，那么这两者之一就有问题,要么是库伦定律,要么是牛顿力学,你们觉得应该是哪个的问题？
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What we need to do is get rid of the Coulomb tag that we have - that's how we measure our electron charges - charge, and so we use this epsilon nought quite often, this permativity constant of a vacuum to make that conversion.
怎么量度电子电荷,所以我们会经常用到,这个epsilon，nought记号,这是真空中的介电常数,我们还要指出,这个介电常数。
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