How Hot Can It Get?

How Hot Can It Get?

Hey, Vsauce. Michael here. And my tea is quite hot,
but it’s not the hottest thing in the universe. So what is?
I mean, we know that there is an absolute zero, but is there an absolute hot?
A point at which something is so hot it can’t get any hotter.
Well to find out, let’s begin with the human body.
Your internal temperature is not constant.
37 degrees, 98.6. Sure. But those are averages.
Your body’s internal temperature fluctuates by about one degree Fahrenheit – half a degree Celsius – throughout the day in a cycle. Assuming you sleep at night, at 4:30 in the morning your body reaches its coolest natural
healthy temperature. And at 7 p.m. it reaches its highest. But a dangerous fever is not good. 108 degrees Fahrenheit is almost always lethal.
The highest recorded air temperature across all of Earth has happened four times in Death Valley, where it has reached 129 degrees Fahrenheit.
180 degrees Fahrenheit is the recommended temperature for water when brewing coffee.
And at 210 degrees Fahrenheit, a cake is done. 2,000 degrees Fahrenheit is the
temperature of lava fresh outta the ground.
But come on. Make your own lava like Green Science Pro. This guy uses
Fresnel lenses to focus the sun’s energy onto whatever he wants.
This is a small piece of obsidian, volcanic glass, which he can melt into actual lava right in his backyard.
Keep in mind that the Sun is having that effect even though it is 93 million miles away from Earth.
Right up on the surface of the Sun is a different story. The surface clocks in at 10,000 degrees Fahrenheit, but the centre, where fusion occurs, is ridiculous. Temperatures there reach 28 million degrees Fahrenheit, which is also known as 15 million Kelvin.
The Kelvin scale has units that are the same size as a Celsius degree, but it’s an absolute scale, where 0 is absolute zero. When matter reaches
temperatures as high as those found in the centre of the Sun, an enormous amount of energy is radiated away.
If you were to heat only the head of a pin to the temperature of the centre of the Sun, it would kill any person within 1,000 miles of it. Speaking of which, the energy emitted by an object often tells us a lot about the temperature of that object.
Any object over absolute zero emits some form of electromagnetic radiation. You and me, we don’t glow visibly, but we do emit infrared light.
We can’t see it, but infrared cameras can.
WBT has great videos and here he is, hiding inside an opaque black trash bag.
Now, we can’t see him, but his body is infra-redly glowing through it.
If you want something to be the right temperature to glow in the visible spectrum, you’ll have to reach the Draper point, about 798 Kalvin.
At this point almost any object will begin to glow a dead red. We can calculate the expected wavelength of radiation coming off of an object because of its
temperature and that wavelength gets smaller and smaller the hotter and
hotter the object gets. It goes from radio waves to microwaves
up through infrared divisible, all the way to x-rays and gamma-rays,
which are created in the middle of our Sun.
At temperatures as hot as the Sun, matter exists in a fourth state.
Not solid, not liquid, not gas, but instead, a state where the electrons
wander away from the nuclei plasma. If you’ve watched my temperature
lean back you know that you could make plasma by microwaving fire But don’t do it. Besides, our Sun isn’t
even close to being the hottest thing in the universe. I mean, sure, 15 million Kelvin is pretty incredible, but the peak temperature reached during
a thermonuclear explosion is 350 million Kelvin, which hardly counts,
because the temperature is achieved so briefly.
But inside the core of a star, 8 times larger than our Sun, on the last day of its life,
as it collapses in on itself, you would reach a temperature of 3 billion Kelvin.
Or if you wanna be cool, 3 GigaKelvin.
But let’s get hotter. At 1 TeraKelvin, things get weird. Remember that plasma we were talking
about that the Sun is made of? Well, at 1 TeraKelvin, the electrons
aren’t the only thing that wander away. The hedrons themselves, the protons and
neutrons in the nucleus melt into quirks and gluons, a sort of soup.
But how hot is a TeraKelvin?
Frighteningly hot. There’s a star named WR 104, about 8,000 light years away from us. Its mass is the equivalent of 25 of our Suns, and when it dies, when it collapses, its internal
temperature will be so great that the energy emitted,
the gamma radiation it flings out into space will be stronger than the entire amount
of energy our Sun will ever create in its entire lifetime. Gamma ray bursts are quite narrow, so Earth is most likely safe,
but what if it wasn’t? Well, when WR 104 collapses, even though Earth is 4,702 trillion miles away, the energy it releases would still be bad news.
Exposure for 10 seconds would mean losing a quarter of Earth’s ozone layer, resulting in mass extinction, food chain depletion and starvation from 8,000 light years away.
Closer to home, right here on earth in Switzerland,
scientists have been able to smash protons into nuclei, resulting in temperatures much larger than 1 TeraKelvin.
They’ve been able to reach the 2 to 13 ExaKelvin range. But we are okay, because those temperatures last for an incredibly brief moment and only
involve a small number of particles. Remember how we could
calculate the wavelength of the radiation emitted by an object based on its temperature? Well, if an object were to reach a temperature of 1.41 times 10 to the 32 Kelvin, the radiation it would admit would
have a wavelength of 1.616 times 10 to the -26th nano meters, which is tiny. Like so tiny, it actually has a special name. It is the Planck distance,
which according to quantum mechanics is the shortest distance possible in our universe. Okay, well what if we added even more energy?
Wouldn’t the wavelength get smaller? It’s supposed to, but yet it can’t.
This is where we’ve got a problem. Above 1.41 times 10 to 32 Kelvin, the Planck temperature,
our theories don’t work. The object would become hotter than temperature.
It would be so hot that what it is would not be considered a temperature. Theoretically, there is no
limit to the amount of energy we could keep adding into the system.
We just don’t know what would happen if it got hotter than the Planck temperature.
Classically, you could argue that that much energy in
one place would instantly cause a black hole to form. And a black hole formed from energy
has a special name – a Kugelblitz.
So basically, what I’m trying to say is when you want to tell someone you
like that you think they are hot, so hot that not even science can
understand it, just call them a Kugelblitz.
Finally, here is something fun.
The Sun is about 4.7 billion years old,
about halfway through its life cycle and so far it has burned 100 Earths worth of fuel, which sounds like a lot, but the Sun is the size of 300,000 Earths. Because of that discrepancy, you can
have a lot of mathematical fun comparing your energy output to the Sun’s.
The Sun is way hotter than us and it puts out way more energy than us.
Bad Astronomy had a lot of fun with this one and although it doesn’t really mean
anything, it is technically true, because of the Sun’s enormous size, that one cubic centimeter of human puts out more energy than an average cubic centimetre of the Sun.
Which should make you feel quite warm inside. И, как всегда, спасибо за смотрящий.
[I, kak vsegda , spasibo za smotryashchiy.]
[And as always, thanks for watching.]

100 thoughts on “How Hot Can It Get?

  1. You know you’re about to have an existential crisis when Michael continiues a sentence with “I mean…”

  2. Well, I know for a fact that the coldest thing in the universe is the cavity where my ex-wife's heart SHOULD be, but instead resides an all consuming black void into which all that is good is destroyed.

  3. Damm kalvin went from kalvin to giga kalvin then mega kalvin then terra kalvin he needs to calm down

  4. Okay, I didnt watched the entire video, at the time imwriting this comment, but I guess, the highest temperature is the planck temperature

  5. i actually thought this video was new until a saw a comment saying this was from 2012 my head hurts is vsauce a god damn government agent

  6. Explain to me again how we know that the sun is 5500 degrees Fahrenheit??? 10,000 or more at its core??? Even if we go by the belief we once landed on the moon, that's a far cry from taking temperature reading from this sun that is so hot and radioactive… all I have ever seen and heard of from "outer space" is theroy and computer imaging…

  7. 20m heat f , u measured that probably, or just throwing shit like that , the same as science is doing from many years.

  8. Question–if heating the head of a pin to the temperature of the center of the sun (15 million kelvin) would have the ability to kill any person within 1,000 miles from the heat, then why wouldn't a nuclear bomb melt the planet underneath, turn everything within (at least) 1,000 miles to ash (as in no debris or anything), and not kill everyone in surrounding countries when it went off? Wouldn't everyone who even tested the bomb have been ignited? Even more, scientists say they've created super-heated gas supposedly 2 billion degrees kelvin. How? What would have held a super-heated gas that is supposedly over 130 times hotter than a sun which could liquidize the planet? How would they have measured the heat with something that didn't vaporize on contact? Just sounds weird.

  9. Heat is energy, 0° kelvin would be the coldest possible, no energy whatsoever. Therefore as hot as it could be would be all energy in the universe concentrated on a singularity.

  10. "My tea is not the hottest thing in the universe." Kinda scraping the bottom of the science-writing barrel, here.

  11. Everyone knows that the hottest thing in the universe is the metal part of the seat belt after you leave your car out in the sun for hours.

  12. I have a question…can you measure the horsepower of things besides engines? Like a person or a nuclear reactor? O R A S T A R ?

  13. Wait a minute I'm confused. Wouldn't that energy from that star from 8000 LY away take 8000 years to reach us and by then wouldn't be at a lesser intensity? As in wouldn't that energy released degrade in the time it takes to travel the distance necessary to reach us?

  14. The particles speed up movement when it gets hotter

    I thought he would say that the maximum temperature would be the closest speed from the light speed of the particles by getting hotter

  15. How do you know how hot it is at the center of a star?

    You have no proof!

    There is no way to even measure the temperature of the center of the sun, so how you gonna sit there and tell us the temperature of the center of a star before it goes super nova?

  16. He did not complete the video.. the hottest anything has ever been is at the beginning of our universe. There was no matter yet it was white light. Once it expanded rapidly and could cool.. the first of matter appeared.

  17. 42c isnt almost always lethal, its never lethal. I personaly have had 42c, halucinated for a bit, seing squerrels on my wall but then i was fine and many of my friends too have had similar temperatures as kids and survived with ease.

  18. if the wave lenght gets smaller than a plank,it will be a continuum of 1 as in 1 is the wave and 0 is the empty between full 1 is solid.Mater.the energy becomes mater.

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