Uploaded: 2020-03-30T02:41:34.000Z
Duration: 6 min 30 s
Description: Thousands of YouTube videos with English-Chinese subtitles! Now you can learn to understand native speakers, expand your vocabulary, and improve your pronunciation...

Hey, Vsauce Michael here coming to you from my hotel room in London

with a little camera that I taped to a bunch of furniture I stacked up.

Which is better than nothing, and as you can tell from the title of this video,

Can there ever be nothing? I mean, we're surrounded by matter all the time.

I know you might think there's nothing in it, but it's full of air.

One cubic centimeter of air contains almost

an awesome word that uses a double u, but not a w.

The challenge, however, is removing all of the air.

To this day, the best scientists have been able to do

is to create what they call an ultra-high vacuum.

of space contains not 30 quintillion molecules,

To put that in perspective, a vacuum cleaner

like you use at home hardly changes the thinness of the air at all.

In fact, if you use a vacuum cleaner at sea level,

the vacuum created inside the operational part of the machine

only has the thinness of air found in Denver, Colorado.

If you want thinner air, if you want even fewer particles per cubic centimeter,

But before we go too far, let's talk about high altitude flying.

When you're in an airplane 30,000 feet high,

the outside air is very thin and dangerous.

So by law, the airplane must keep the inside of that commercial aircraft pressurized

so that it only feels like you're no more than 8,000 feet high.

The reason it's dangerous is that when air gets that thin,

there's not enough oxygen for your brain.

This man is about to remove his mask temporarily and with supervision

in the actual thinness of the air around him.

Within less than a minute,  he suffers from hypoxia,

Even though he appears to be awake and alert,

when told to put his mask back on or else he will die,

But a lack of oxygen, a lack of air, a lack of matter

can get even more dangerous when you go above 60,000 feet,

about 19,000 meters above the surface of the earth.

This limit is known as Armstrong's Limit.

We all know that the boiling point of water

and at Armstrong's limit, the boiling point for your own blood

drops all the way down to the temperature of your own body.

If you reach that altitude without wearing a special suit,

bubbles will form inside your blood, and your body

But because your internal organs and your skin are flexible, you won't explode.

Out gassing is why it's so difficult for us to reach an ultra high vacuum.

If you remove so much air from this glass,

there's fewer than 100 particles per cubic centimeter.

The glass itself or whatever material your chamber is made out of

will start to lose its own trapped gasses.

But materials don't need to be inside partial vacuums to out gas.

It happens all the time, and is especially noticeable in confined spaces.

All of the adhesives and chemicals used to make that car

creating what we know as the new car smell.

Now remember that in a laboratory, the best vacuum we've been able to create

is about 100 particles per cubic centimeter.

Well, between the planets and our solar system,

there is space that only contains ten particles per cubic centimeter.

And if you leave our solar system in the innerstellar space,

you're only going to find about one particle per cubic centimeter.

The real winner though is intergalactic space.

Leave the Milky Way altogether and you can find regions

where there's only one or two particles per cubic meter.

Okay, that's cool and all, but would it be possible

to find a region of space where there is absolutely

Well, according to quantum mechanics, no.

First of all, you've got gravitational and electromagnetic fields

that extend forever, because the particles that cause

those fields to happen have no mass whatsoever.

there's a thing known as virtual particles that's happening all the time,

even around us right now where there's no vacuum.

These virtual particles come into existence and then disappear.

And we believe they exist for a couple of reasons.

One big reason is the fact that our universe

continues to expand, even though that shouldn't necessarily happen.

Where are we getting that extra force that pushes it, that causes it to keep expanding?

Well, these particles that pop into existence and disappear may be the answer.

Even crazier is an effect we've observed known as the Casimir Force.

If you put two pieces of metal nanometers apart inside a vacuum,

One of the most popular theories for why this happens

is that these virtual particles popping into space and then disappearing

are actually reflecting off of the metal.

But because the plates are so close together,

particles with wavelengths longer than that gap

Subtitles ListPlay Video

‌‌

matter

force

commercial

reflect