Pretty sure the coldest spot in the universe is my bathroom floor in the morning.

@kennyshullai8753

Жыл бұрын

Hear hear.

@seriousmaran9414

Жыл бұрын

I remember visiting someone in the winter in the 1960s. Unheated outside privy with snow on the ground. There was ice inside but I defrosted it a bit.

@nvkulk

Жыл бұрын

No…toilet seat

@surfingonmars8979

Жыл бұрын

You’ve never experienced a wife’s heart………….

@David-di5bo

Жыл бұрын

@@surfingonmars8979 🥶

OK, now I would love a video about negative temperatures please! Thanks for this one too, I had no idea they had come so close to absolute zero.

@Quantanaut

Жыл бұрын

From what I know, you can only have negative temperature in a system that has a maximum energy limit. If there's a maximum energy, then that max energy state will have low entropy (since there's only one way to have that max energy), and due to how temperature and entropy are related, the math works out that some states have negative temperature.

@cghc9935

Жыл бұрын

-20 degree Celsius.

@michaelsommers2356

Жыл бұрын

And the video has to have lots of songs.

@txmike1945

Жыл бұрын

minus 40. You have to guess if it is degrees F or degrees C.

@michaelsommers2356

Жыл бұрын

@@txmike1945 By negative temperature, he's talking about the Kelvin scale.

You can’t drop a gem like “negative kelvin” without a follow up video! Looking forward to it!

@feynstein1004

Жыл бұрын

Sixty symbols, my man. Here's the link: kzread.info/dash/bejne/q4iZpLepgpSdgto.html

@live_long_and_prosper

Жыл бұрын

How about "i" imaginary temperatures?

@feynstein1004

Жыл бұрын

@@live_long_and_prosper Is that even possible?

@thegorn

Жыл бұрын

No such thing as negative Kelvin

@feynstein1004

Жыл бұрын

@@thegorn Just watch the video I linked to

I’d absolutely love to see a video about negative temperatures

@Epoch11

Жыл бұрын

Here here!

@petergreen5337

Жыл бұрын

Me too very interested.

@ArawnOfAnnwn

Жыл бұрын

So basically negative (Kelvin) temperatures have to do with the probability distribution of the particles in the substance. Ordinary matter will have the distribution wherein particles are far more likely to be in the lower energy states than higher ones, so the majority of particles are low energy with a minority at high energy. Negative temperature happens when this distribution is reversed, so now particles being in high energy states in more likely and so the majority of them are high energy. Since the flow of energy is from high energy states to lower energy states (thus why hot stuff cools), the flow is from negative temp stuff to positive temp stuff.

@jamescarlisle3770

Жыл бұрын

okay Dr Lincoln you've raised a real hair on my head and I'm absolutely bald, when you mentioned negative Kelvin temperatures being hotter than the coldest Kelvin temperature. please tell me what that might mean if applied to the earliest moment in the universe.

@itsROMPERS...

Жыл бұрын

This is only theoretical and cannot exist in nature.

Definitely want to know more about negative temperatures now!

@petergreen5337

Жыл бұрын

Same here.

@ArawnOfAnnwn

Жыл бұрын

So basically negative (Kelvin) temperatures have to do with the probability distribution of the particles in the substance. Ordinary matter will have the distribution wherein particles are far more likely to be in the lower energy states than higher ones, so the majority of particles are low energy with a minority at high energy. Negative temperature happens when this distribution is reversed, so now particles being in high energy states in more likely and so the majority of them are high energy. Since the flow of energy is from high energy states to lower energy states (thus why hot stuff cools), the flow is from negative temp stuff to positive temp stuff.

@Tomas.Malina

Жыл бұрын

Sadly, It's just a "feature" (not a bug!) Of the statistical definition of temperature, nothing extraordinary about it. Still, I agree, any video by Don is appreciated 🙂

@feynstein1004

Жыл бұрын

Sixty symbols to the rescue. kzread.info/dash/bejne/q4iZpLepgpSdgto.html

I love the Fermilab videos. The presentation makes it easy to understand what are often difficult subjects

What is an absolute privilege.🙏🙏 for all of us who never went to uni.., and certainly no where near a lab.. to get to hear from / share in Fermilab.. way cool👍… cheers

Dont stop the videos man. Keep them rolling

Measuring it to be 38picokelvin is another genius.

Never stop making these videos Dr. Lincoln!!! I have learned so much with your down to Earth teaching style. And from that I dug deeper into topics that intrigued me and learned so much more. The way you taught relativity and gravity finally got me past the hurdle I had been having fully understanding those concepts and their implications. Thank you so much and see you on 12/9/22. I'll be prepared with lots of questions if there is a Q&A.

Dude, glad you are still rockin the fermilab vids! Your articulation and humor are Absolute.

Thank you for all the effort you put into your videos

Dr. Don, we need a video to explain the other end of hot, as with Absolute Zero and the explanation of Planck Temperature. There is stuff on the Internet but a Dr Don explanation would be much better.

Fascinating! Excellent vid as always! Keep up the great work! 👍

@petergreen5337

Жыл бұрын

Agreed.

i like your sense of humor.i also enjoy the way you simplify the concepts without coming off as condescending.Thats a trait of someone that's genuinely intelligent

I love the way he talks, so relaxing

I’m more interested in how a thermometer is capable of measuring those temperatures, than how the temperatures were achieved.

@markholm7050

Жыл бұрын

I also would be very interested in a video describing how very low temperatures are measured. Don Lincoln is a theoretician. We need an experimental physicist who works with very low temperature experiments to describe it for us.

@XEinstein

Жыл бұрын

I think those temperatures are not measured but calculated

@TheUglyGnome

Жыл бұрын

These low temperatures are measured by measuring kinetic energy of the molecules, which is in fact the definition of temperature.

@nathanmays7926

Жыл бұрын

@@TheUglyGnome yes, but how do you measure kinetic energy of molecules at that scale? i’m not doubting it’s possible… i’m just curious how it’s done

@rykehuss3435

Жыл бұрын

@@nathanmays7926 Probably with the lasers theyre using.

My bedroom at the minute

@C--A

Жыл бұрын

Get a electric blanket bud ♨️

I must say Dr. L that this was a very very cool video! Good seeing you back here! 👍👍💥💥

Good video Dr. Lincoln, thanks.

1:56 got a smile back to school days with pupils being told off for using "DEGREES Kelvin" (being an absolute scale rather than relative). The history is more complex, of course. : )

I once saw the coldest place in the known universe. It was in a cupboard in the Physics department at Lancaster University in 2008. At they time, they held the record for the coldest temperature yet achieved. They've lost that record since then, of course, to those Rubidium atoms Don mentioned.

@markzambelli

Жыл бұрын

" _It_ was in a cupboard in the Physics department at Lancaster University..." 'It'...? when you refer to my wife I'd rather you use her name... 😈

@DavidBeddard

Жыл бұрын

@@markzambelli Ooph, that's cold, man! 🥶

@colinhughes6635

Жыл бұрын

@@markzambelli g

Loved the presentation. Thank you!

I'd love to see a video on how those nano and pico-Kelvin temperatures are measured. The instruments to measure those crazy cold temperatures must be as amazing as the processes to create the crazy cold temperatures.

@donzxcv1

Жыл бұрын

probably mostly theoretical , on paper only

@JayTemple

11 ай бұрын

Keeping in mind that heat is molecules in motion and temperature is the amount of motion per unit time, it might actually be a simple reading of (microscopic length) / time = some number of pico-Kelvins.

Awesome Video as always 🙂

5:44 Nice colors picked to represent different helium isotopes.

Mind-blowing ... thank you for the informative video.

I vote for a video on negative temperatures! 👍

Very interesting. It is mind blowing. The video was centered on the techniques to reach such insane temperatures. I was wondering how you can MEASURE such temperatures. It would be interesting to have a video on the techniques used for that.

YaY 🎉 Dr Lincoln is back on! I’ve missed you and your wisdom gifts.

Amazing video Dr Lincoln ❤

Would love to have a video on Negative temperatures. I heard about them while studying lasers, but would like to see other examples.

We would like to see, we need, a video about negative temperatures please!

@dylanotto1675

Жыл бұрын

He explained everything in the song at the end

I was just talking to my son about this the other day and asking some of these same questions. So glad to have a video on it!

Yes more videos! And singing too, anytime. Thank you very much.

According to my cold-hating husband, it's blooming freezing right now, so much so that he's just put the heating on. I've got it turned off in my room, it's not that cold! Give him until January and he'll be claiming it's as cold as the CMB 😉 Excellent video as ever! I love your explanations. 😀

As always very interesting1 I would definitely be interested in a negative temperature video. How do you measure these ultra low temperatures?

@SeraphRyan

Жыл бұрын

I can't go into the specifics (cause I dont know the exact specifics) but they trap atoms in laser beams and the laser beams cool the atom down. From what I know, the photons get absorbed and re-emitted from the trapped atom, taking excess kinetic energy from the atom too. This causes the atom to cool down.

Two new things have been added to my bucket list. 1) A video explaining negative temperatures, and 2) Hearing Dr. Don's rendition of the Frozen theme song.

@JayTemple

11 ай бұрын

After this video, I think "In Summer" would be more appropriate.

My warm thanks to your very cool presentation

amo estos videos. me gustaría el de temperaturas negativas y también algo sobre computadoras cuánticas y de grafeno. gracias

@petergreen5337

Жыл бұрын

Me too.

Fahrenheit is actually based on the freezing and boiling points of brine, a particular ratio of a mixture of salt and water, because brine's freezing and boiling points are much more stable and consistent then that of water, who's freezing and boiling points can vary quite a bit depending on atmospheric pressure, which varies with altitude and can even vary in a single place (barometric pressure)

@ericvilas

Жыл бұрын

it's actually just based on the freezing point of brine (Fahrenheit never considered the boiling point), as well as the freezing point of water being 32° = 2^5 so he could measure out a degree by dividing the difference between the freezing point of water and the freezing point of brine in half 5 times. Also, the difference between the freezing and boiling points of water is 180° because base 60 (thank you, Rømer scale). (technically brine was actually not the original definition: it was just a precise way to achieve the temperature he originally wanted to approach which was simply the coldest temperature ever recorded in his home city of Gdansk, which he used as an estimate for the coldest temperature bearable for a person)

@JayTemple

11 ай бұрын

@@ericvilasScott may have just given a more precise version of what I was told. If you dissolve something into water, its freezing point goes down. 0 Fahrenheit was supposed to be the lowest that you could force that point. IOW, at a temperature above 0, water MIGHT not freeze depending on how much other stuff has been dissolved into it, but at 0, it WILL freeze.

thanks for the video. Very informative.

Excellent video as always. I'd also like to understand more about negative Kelvin!

At 5:50 in the video, you state that the helium 3 diffuses into the helium 4 and that carries away energy causing the helium 4 to be even colder. Don't you mean the helium 3 to be even colder?

@drdon5205

Жыл бұрын

yep

@kerajit

Жыл бұрын

Yep, I also was a bit confused.

When can we expect that negative kelvin video?

@TheRolemodel1337

Жыл бұрын

there is a video about it on sixty symbols if you cant wait 😁 /watch?v=yTeBUpR17Rw

Thank you very much publisher another interesting lecture.

Elegant explanations

Fascinating!

These Fermilab videos are excellent.

Whenever you upload a video and I notice it in my notification box I get Goosebumps

This entire video was a tease. Now I want to see dedicated videos on each method of cooling, negative Kelvin temps, and the quantum issues of absolute zero.

superb - as usual

Just found Fermilab this morning. What a perfect site for those of us that are curious but ignorant. Great presentations.

Thanks. That was really cool.

Love these. 🙂 Thanks so much for creating the videos. You're an excellent presenter, too, so... I think Carl would have proudly smiled in quite a congenial gesture of intergalactic amity! 😁 🐲✨🐲✨🐲✨

I just happened to read this (link shared). Would love to see you explains this. Thanks 😊

VERY NICE PRESENTATION !

Very interesting, great video.

Thank you. 🇬🇧

every video I seen from this channel is not wasting any time it even goes a little bit too fast for me I am 57 but I can always rewind and go back till I get it. ;)

I like these video's. Don't get too nerdy or arrogant and are very easy to understand. Thank you

loved thank you

Sounds like nothing in the universe can get as cold as those micro, nano and picokelvins in the lab. But isn't the temperature of super-massive black holes technically near or even below a picokelvin?

Excellent explanation!.. thanks. Could you make a negative Kelvin video? Thanks so much!

Totally want to see the video on negative temperature and see how you'd teach the concept of population inversion. :) Also, make a separate version with the singing. We all wanna hear that!

Hello Dr Don! It would be magnificent if you make an splendid video on negative Kelvin Thank you very much.

If I remember my physics course in school, you cannot actually observe absolute zero. Because the actual measurement of absolute zero would raise the temp above absolute zero. Much like the Schroeder’s cat postulation that by observing the state changes the state.

Very interesting! I would love to see a video about negative temperatures.

You get extra points for showing and comparing the different temperature scale systems early on.

Hello. I love your videos and you were able to personally answer a question for me no one else had. How about a video on Dark Matter vs. MOND.

Very interesting. I would love to see a video of the professor singing "Let it go". Please!

Thanks for the topic guys and FAB ending....

You are THE MAN!!

With respect, Black hole temp is absolute zero. Subscribed just now. Great video!

I’m geographer but love this channel more than anything ❤❤❤ thank you 🙏

Haha great job on this one. Especially the cut at the end lol

Let Dr Don sing the song! LOL, wonderful ending.

I am now absolutely curious to understand what happens at negative Kelvin temperatures. Great video. Thawing. Thanks.

@frederf3227

Жыл бұрын

Normal matter maximizes entropy by absorbing energy from something else. A negative object is one that increases entropy by giving up energy. Touching a negative temperature object wouldn't freeze you, it would burn.

You are a national treasure, Don.

All national labs should do something similar to Dr Lincoln/Fermilab videos on their KZread channels as well, of course on different subjects and fields.

I think the easiest way to demonstrate what negative Kelvin means is following: Something with positive Kelvin means it is moving. Zero Kelvin means it does not move. Negative Kelvin means it is moving backwards. But most importantly it is moving.

That was the best exercise of editorial control I have ever seen.

One of my favourite jokes from Futurama is when they’re on Pluto and Leela says “We’d best get inside, with wind chill it’s 20 degrees below absolute zero”

dr. Lincoln, you're the man. I would like to always heard deeper insights to these topic´s, like negative temps, as thoroughly as you did with relativity. I didn't know that fermilab is such a big deal. I live in Europe, an thought you are some doctor working at some "doctor facility", and fermilab was your "youtube" lab/ something "made up" name for youtube, but dammit, fermilab is the real deal 8) Absolute gold content, one of the most underrater or more likely, under-watched channels there is

@JohnDoe-rm1kw

Жыл бұрын

Apologies in case you allready know, thers a German Dr.Lincoln Style Prof. having explained (in german) about what might happen at negative-kelvin-temps. Check out "Urknall Weltall und das Leben" channel on YT. (Mr. Gassner enthusiastically tries to explain whats goin on at minus Kelvin) 🤣

I really appreciate what I have learned from you >> Science! Sciences' discoveries, inventions educations had changed all the human life better every day.

Please do explain negative temperature next. Would love the mind bending stuff🤩.

C’est passionnant MERCI

Yeah Don, we're gonna need that video on negative temperatures

This is fantastic

I did subscribe sir, and thanks for this intresting topic. I believe you're the physics god. It's hard to explain difficult and complicated physics topics in a simplified way like you do. Please can you refer me to a video discussing quatum leap and atomic orbitals it'll be very helpful.

Cold temps is a hot topic! Would love to see a vid on negative kelvin?

Great video! I love to be educated.

"Negative temperatures are just messed up and to explain them would take its own video." Well volunteered Don! I'm looking forward to it!

All I want for Christmas is Dr Lincoln doing a negative kelvin video

I would LOVE to watch a video on negative temps!!

Loved the warning...

Quantum mechanics is so weird that it doesn't allow synonyms to exist simultaneously: "quantum physics doens't allow for objects to be simultaneously stationary and precisely located" "stationary" means staying in one unchanging location, which means it is always precisely located in one spot, they're basically synonyms

I'd love to hear Dr. Lincoln's song !

Thank you Don. What we mean by molecules/particles vibrating is that bonding is not in perfect frequency synchronicity. That is, the pairing electrons that create a bond do not always couple and fly off as heat and the result of this is that particles momentarily move away from each other and return when bonding resumes. This is a random process dependent upon internal arrangements and external environment. When particles match perfectly in terms of quantity (mass) and kind (bonding angles) the frequency mismatch is minimised, however external environment will still have an affect. To shield from external environment one has to implement the Schwarzschild solution via magnetic field and voila! The coldest place in the Universe. Wait a minute, isn't that a black hole?

@SoundzAlive1

Жыл бұрын

Another video for this. André in Sydney

Dr. Don!