As you probably know by now, we’ve been working with Google and YouTube to answer
ten of the most popular science questions asked on the internet.
And I gotta hand it to you, because there are few questions that are as confounding
非常复杂 又使人着迷 让人鼓舞 并且受到众人关注
and complex and fascinating and inspiring, as this one the collective consciousness has
What is energy?
我是汉克·格林 这里是 World’s Most Asked Questions频道（世界上提问最多的问题）
I’m Hank Green, and this is the World’s Most Asked Questions.
Energy is everything.
It’s one of the true constants of the universe, because as long as there’s been a universe,
there’s been energy.
And while it comes in lots of different forms that can seem different to us, they all amount
to the same thing: Energy is the ability to do work.
And work is just the act of displacing something by applying force.
So, say you stomp on a stomp rocket.
The force of your foot hitting the pedal is turned into the force of air leaving the cannon
— sending your rocket sailing.
Or maybe you’re enjoying a nice patty melt — the energy from that food is broken down
for all of the quadrillions of cells that you have to do all of the things that they
例如复制你的DNA 聚合并修复蛋白质 从一个地方输送物质
have to do — make copies of your DNA, assemble and repair proteins, transport materials from
到另一个 促使肌细胞收缩 你知道的 让身体每一部分保持活力
one place to another, make muscle cells contract — you know, all the stuff of being alive.
火箭飞行 细胞辛勤工作 你的手机或者电脑现在正常运作
That rocket sailing, your cells toiling away, your phone or computer being on right now
to watch me — that’s all work being done.
And the ability to do these things is inherent in everything around you.
Even things that look inert, completely lacking in energy.
Like this log.
This log, for example, is chock full of chemical energy because it’s made up of combinations
碳 氢 氧组合成为木质素 这是木头的组成成分
of carbon and hydrogen and oxygen formed into lignin, which is the stuff that makes up wood.
每个原子之间的联系 木质素里的每个分子 都含有能量
All of the bonds between all of those atoms, in every molecule of lignin, contain energy.
How do I know?
因为如果我施加足够多的力 像加热 去破坏这些原有的联系
Because if I were to apply enough extra energy, like as heat, to break those bonds — it would
release that chemical energy as fire.
That chemical energy also the kind of energy you get from that patty melt — your body
is fueled by the chemical bond energy in sugars, fats, and proteins.
But this log also contains nuclear energy!
这根木头里的每个原子都有一个原子核 质子和中子组成原子核 而那些将它们
Each atom in this wood has a nucleus, made of protons and neutrons, and the energy that
binds them together is one of the most powerful sources of energy in the universe.
If you could split one of the atoms of carbon or hydrogen in this log, and rip those protons
and neutrons apart, it’d release some of that energy.
There’s so much nuclear energy in each atom that, if I could unleash all of it that’s
in this log?
There’d be a giant smoldering crater where I’m standing and everyone in the town of
Missoula, Montana would be dead.
所以 每个由原子构成的事物内部都蕴含着核能量 而且
So, everything that’s made of atoms has nuclear energy locked up in it, but also,
it turns out, that mass and energy are the same thing!
You might have heard of this little equation that a German patent clerk came up with about
a hundred years ago: E = mc^2.
And there are SO MANY OTHER KINDS of energy that I’d love to get into if we had the time …
.. but even though they may seem different, they can all be used to do work, whether it’s
驱动涡轮机 转动一个发动机活塞 亦或是让你的平板电脑屏幕发光
driving a turbine, or moving a engine piston, or allowing the screen on your tablet to glow.
再或者 最神秘的能量 暗物质能量 促使宇宙膨胀
Or, if it’s that most mysterious of energies, dark energy, causing the universe to expand
more than it seems like it should.
But here’s the thing to remember.
Once the work is done, the energy isn’t done.
Because energy never goes away.
能量不能破坏 同样的 也不能创造
It can never be destroyed, and in the same way, it can never be created.
它只能从一个地方转移到另一个 就比如 芝士牛堡三明治所含的
It can only be transferred from one source to another — like, how the energy in the
plants and animals that were in the patty melt were transferred into you — or it can
be transferred from one form into another — like the chemical energy in the wood being
transferred to light and heat as fire.
You could think of the universe as a constant flow of energy, and we are just little pit
stops along the way.
现在你的身体各项机能正在做的—— 你的肺吸收氧气 你的心脏
Everything your body is doing right now — whether it’s your lungs absorbing oxygen, your heart
pumping blood, your brain cells firing as you watch me and learn things — all those
things are using recycled energy that’s been around since the origin of the universe.
And by simply being alive, you’re releasing that energy back into the environment around
you, to be used by other things in other ways.
各位网民 现在来回答你的问题 能量可以是任何事物
So Internet, to answer your question: Energy is everything.
And for those of you who answered our questions on our SciShow survey, where you feel like
you get your energy may be keeping you up at night.
Survey takers who have a hard time falling asleep nearly every night get their energy
from knowledge first, second from purpose.
Of all the fascinating questions in the world, what question do you want to see answered most?
Let us know on Facebook or Twitter or down in the comments down below and we will aim
to answer those questions in a new video at the end of the month.