Name: 氫氣從哪裡來？ (Where Does Hydrogen Come From?)
Uploaded: 2021-01-14T06:25:50.000Z
Duration: 3 min 8 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

When you drink water, you’re drinking the most abundant element in the universe, but

You might not think about it in such scientific terms, but you consume a lot of hydrogen,

and you’re even made of hydrogen! Which is less creepy than it sounds; you’re not

Hydrogen is the simplest element with just one proton orbiting its nucleus, a simplistic

arrangement that allows it to hold the top spot on the periodic table of the elements.

It’s also the most abundant element in the universe with helium coming in at a distant

When the Universe was a fraction of a second old, immediately after the Big Bang, it was

about 92% hydrogen atoms and 8% helium atoms by number which is roughly three-quarters

hydrogen by mass with trace amounts of other elements.

As the universe cooled, these early atoms stabilized and cooled into gas clouds that

eventually clumped together to form protostars. Those protostars got massive enough to develop

their own gravity, drawing other material into them, adding mass, pressure, and heat

until hydrogen atoms are able to fuse together to form helium. These became stars, the fusion

Heavier elements are also formed inside stars, and when stars die and explode, they send

those heavier materials spewing throughout the universe where they were eventually incorporated

into new stars and protoplanets that became bodies like our Earth.

So all those elements that are in stars are in our planet as well, but not in the same

amounts. Hydrogen might be the most abundant element in the universe but it’s pretty

The name hydrogen comes from the Greek hydro meaning "water" and genes meaning "forming,"

so its existence is linked to water as you might expect; It’s the H in H20. But though

[a][b]the cells that make up our body have a high amount of water, hydrogen only makes

up less than 10 percent of the material in the carbon-based human body and less than

0.15 percent of the material that makes up the Earth!

Our planet is rich in oxygen, nitrogen — which are the most abundant elements in our atmosphere

— and silicates, which make up the bulk of the material in the crust. Hydrogen is

largely found in compounds like water, and what hydrogen that does reach the Earth doesn’t

stick around; it escapes pretty quickly from the atmosphere. The Earth’s gravity just

But it’s immensely useful. Hydrogen is used in rocket fuel, welding, the production of

hydrochloric acid, and reducing metallic ores. And as a fuel, it’s a clean fuel. Hydrogen

carries energy without carbon in it, so when it burns it produces water as a byproduct.

But there’s a chance we could get hydrogen from elsewhere, namely off the planet, and

use it. Companies like Planetary Resources are looking at mining asteroids not for precious

metals but for elements like hydrogen that could be used to make fuel, literally fueling

space exploration and potentially vehicles on Earth as well.

If you want a basic breakdown of hydrogen, check out this video from our brand new show

So what do you guys think about hydrogen as a clean fuel. Is it worth tapping into the

Let us know in the comments below! Or let us know on Twitter @DNews, and I’m on there

as well as @astVitnageSpace. And of course, for more DNews every single day of the week,