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This is titanium sponge that comes out of the bottom of this reactor, and it subsequently re-melted in a vacuum arc furnace.
海绵状的钛,从反应器的底部出来，随后在真空炉中重新熔炼。
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And, in between, there is void, which is very similar to how we would describe vacuum.
而存在其中的，就是虚无了，那是与我们描述的真空很接近。
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And so an experiment said the gas didn't increase its temperature when it expanded the vacuum.
这个实验告诉你,气体在向真空膨胀的过程,中温度没有升高。
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Then here's the favorite of all time, vacu-pants, attached via the hose to your vacuum cleaner.
这是最受喜欢的,真空裤法,需要与真空吸尘器的管子相连
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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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And so we have gas and we have vacuum.
这边是气体，这边是真空。
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There is the permittivity vacuum. It is all up there.
这儿还有真空中的介电常数，看，全在这里。
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I'm going to create a vacuum.
我创造了真空。
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When you expand a real gas into vacuum, the temperature goes down.
当一个真实气体，向真空膨胀咱的时候温度会下降。
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well since the gas is expanding into vacuum no work is done.
因为气体是向真空膨胀,因此这个过程不做功。
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In addition to that, we have that epsilon nought value, remember that's the permittivity constant in a vacuum, and basically that is what we use as a conversion factor to get from units. We don't want namely coulombs to units, we want that will allow us to cancel out in this equation.
这是电子的电荷，此外，我们有epsilon零，记住这是真空的介电常数，这是我们用来转换单位的转换常数,我们不想用库伦单位，我们希望这个可以在方程中约去它。
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This is the permittivity of vacuum.
真空中的介电常数是。
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Epsilon zero is the permittivity of vacuum.
0是真空中的介电常数。
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In other words, this is vacuum.
换句话说，这是真空。
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