Name: How Hot Can It Get?
Uploaded: 2016-09-21T08:20:10.000Z
Duration: 10 min 3 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...

Adverbs of degree

Michael here. And my tea is quite hot, but it's not the hottest thing in the

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

Sure. But those are averages. Your body's internal temperature fluctuates

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.

lethal. The highest recorded air temperature across

all of Earth has happened four times in Death

degrees Fahrenheit. 180 degrees Fahrenheit is the recommended

when brewing coffee. And at 210 degrees Fahrenheit,

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.

million degrees Fahrenheit, which is also known

has units that are the same size as a Celsius degree,

absolute zero. When matter reaches temperatures as high as those found in

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

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

visible spectrum, you'll have to reach the Draper point,

about 798 Kalvin. At this point almost any object

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

But don't do it. Besides, our Sun isn't even close to being the hottest thing in

I mean, sure, 15 million Kelvin is pretty incredible,

but the peak temperature reached during a thermonuclear explosion

Kelvin, which hardly counts, because the temperature is achieved

so briefly. But inside the core of a star,

on the last day of its life, as it collapses in on itself,

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

104, about 8,000 light years away from us.

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

so Earth is most likely safe, but what if it wasn't?

even though Earth is 4,702 trillion miles away,

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How Hot Can It Get?

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