評論
打印
OK, one more thing, if I can even get more bizarre.
另外還有一件事是更難以想象的
Since virtually all the mass of an atom is in the nucleus
既然事實是原子的全部質量集中在原子核，
now, there is some amount of mass in the electrons, but most of it is in the nucleus
當然電子也有一定質量，但是可以忽略。
how dense is the nucleus? Well, the answer is crazy.
那么原子核的密度是多少？你會覺得不可思議。
The density of a typical nucleus is four times 10 to the 17th kilograms per meter cubed.
一般而言，原子核的密度是4乘以10的17次方千克/立方米。
But that's hard to visualize. OK, I'll put it in English units.
但數字是難以想象的，那么換作英制單位是
2.5 times 10 to the 16th pounds per cubic feet.
2.5乘以10的16次方磅/立方英尺。
OK, that's still kind of hard to figure. OK, here's what I want you to do.
當然這還是難以理解的，不如我告訴你怎么做。
Make a box that is one foot by one foot by one foot.
做一個各邊都是1英尺長的盒子，
Now let's go and grab all of the nuclei from a typical car.
然后集合一堆重量相當于一輛汽車的原子
Now, cars on average weigh two tons.
車子一般而言重約兩噸。
How many cars' nuclei would you have to put into the box to have your one-foot-box have the same density of the nucleus?
要在盒子里放多少輛車子的原子才能讓這個每邊1英尺盒子的密度等同于原子核呢？
Is it one car? Two? How about 100? Nope, nope and nope.
一輛，兩輛，還是一百輛？都不是。
The answer is much bigger. It is 6.2 billion.
答案是不止如此。需要62億輛。
That is almost equal to the number of people in the Earth.
這差不多是世界人口總數。
So if everyone in the Earth owned their own car and they don't
所以假設地球上每個人都擁有一輛車，當然并非如此，
and we put all of those cars into your box.
我們把這些車都裝進你的盒子里，
That would be about the density of a nucleus.
就差不多相當于一個原子核的密度。
So I'm saying that if you took every car in the world and put it into your one-foot box,
我的意思是你把世界上每一輛車都裝進一個每邊1英尺長的盒子中，
you would have the density of one nucleus. OK, let's review.
你才得到原子核的密度。我們回顧一下。
The atom is really, really, really small.
原子極其渺小的。
Think atoms in a grapefruit like blueberries in the Earth. The nucleus is crazy small.
柚子中的一粒原子就相當于地球上的一顆藍莓。原子核更是出奇的小。
Now look inside the blueberry, and blow it up to the size of a football stadium, and now the nucleus is a marble in the middle.
把藍莓放大到足球場一邊大，原子核就是其中央的一顆彈珠。
The atom is made up of vast regions of empty space. That's weird.
原子的組成是一大片空間。這是很不尋常的。
The nucleus has a crazy-high density. Think of putting all those cars in your one-foot box. I think I'm tired.
原子核有極高的密度。這好比把所有的車放進每邊為1英尺的盒子中。我想我累了。
