There's No Such Thing As Cold
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- Опубліковано 18 січ 2015
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If cold isn't real, then how can I feel it?
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You've felt cold before. Sometimes it's cold outside. But what if I told you that "cold" isn't real? There's no substance or quantity called "cold" in science. We can't measure the amount of "cold" in something. Instead it's about what's NOT there. In this week's video, learn the difference between heat and temperature, why a wind makes us feel colder, and what it's like to live as a mass of jiggling atoms. This is the physics of cold
Cool PBS NOVA episode on the search for absolute zero: • Video
Richard Feynman on jiggling atoms: • Feynman: What things r...
The movement of atoms in a wind: www.newton.dep.anl.gov/askasci...
Why a breeze feels cool: physics.stackexchange.com/ques...
Density of the interstellar medium: en.wikipedia.org/wiki/Interste...
Have an idea for an episode or an amazing science question you want answered? Leave a comment below!
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It's Okay To Be Smart is written and hosted by Joe Hanson, Ph.DFollow me on Twitter: @jtotheizzoe
Email me: itsokaytobesmart AT gmail DOT com
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For more awesome science, check out: www.itsokaytobesmart.com
Produced for PBS Digital Studios
Joe Hanson - Creator/Host/Writer
Joe Nicolosi - Director
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Dalton Allen - Post-Production Intern
Theme music:
"Ouroboros" by Kevin MacLeod
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There's also no such thing as dark, skinny, or silent. A lot of our words describe the absence of something that's usually there.
SKINNY??? REALLY GENIUS ? 😂😂😂
Dino Rod Yes, because skinny is the absence of fat.
@Michael OchoaRomero technicaly thats the right ammount of fat ;-;
Light is the absence of darkness. Not the other way around
@@ferddoesweirdthingsinlife1040 what's the source of darkness?
2:45 - you would not freeze instantly.
The vacuum in space is a nearly perfect isolator, so the warmth can not got anywhere.
It takes some time that your bodyheat will radiate away.
HajoBenzin1 According to calculations for an astronaut as perfect blackbody, it could take as much as 12-18 hours or as little as ~30 minutes, just depends on how low you want to call "freezing"
More here: physics.stackexchange.com/questions/67503/how-fast-would-body-temperature-go-down-in-space
It's Okay To Be Smart
oh, ok! thx :) but 30 min - 18 hours is really not "instantly" :D
HajoBenzin1 I dunno, in the scale of the universe, that's practically no time at all :)
And in the scale of a mayfly, it's practically all time :)
It's Okay To Be Smart 18 hours seems a bit optimistic, especially with solar radiation hitting you for at least part of it. Maybe if you were in deep space.
I work in the hardwood flooring industry. We use a light cement to self level underneath the wood floor. I tried explaining this to my coworkers about how the heat is moving towards the absence of heat, and how there is no such thing as cold and how the cement dries. Everyone thought I was absolutely crazy and I felt like a genius compared to everyone even though they thought I was a fool.
him: it's -1 degrees Celsius
also him: I'm cold
*laughs in russian*
Ха-ха-ха!
VODKA VODKA VODKA
It rained also
Хахахахахахахаха
here in northern VA it gets to -9 degrees C AT THE MOST in winter, for an all time low. Maybe some winters itll -18 C but not very often. ugh i hated using a converter for farenheight to C
For people who don't get it: heat is something that exists, coldness is only a term to describe the lack of it.
So who uses or made up the words to decide this?
When you're cold are you going to start saying damn I'm 40° hot
You should have asked which one has more thermal energy, not which one is "hotter".
Well, if he did, then couldn't have followed up with the information about thermal energy like he did
Pish posh
@@WhoElseButZane 😂
True, temperature depends on average kinetic energy not the total kinetic energy
well, arent they the same, like the more thermal energy you have the hotter you are, isn't that right ?
As a person with glasses I chuckled to myself when he blew on the tea
Me too 😂😂 like when you come out of a cold store.
Same 😂😂😂😂
My glasses always be like every where 👓🌫️
3:47 as someone who is british and has glasses i know that struggle.
Ikr, happens in rain, and when I drink tea... Mmmm tea...
umm brittish? what does that has to do with the fact of getting steam on the glasses.. I'm argentinian and I drink mates and the same thing can happen to me, also colombians if they drink coffee... your comment is just.. dumb.. and over-patrioted
@@someware1636 brits love their tea! It's only a joke.
😂😂😂
@@MichaelFlatman even Indians
So why would we freeze almost instantly in the emptiest places in space? Where is the heat going if there is no dense matter for it to transfer into?
Isles of Scion Radiation! You emit it like anything else
It's Okay To Be Smart Fascinating. Thanks for the quick response :). This was going to bug me.
That answer is obvious in hindsight. But what isn't? :p
You don't...
That is a myth.
It's Okay To Be Smart .
You must realise that for heat to be transfered effectively (flash freezing) you need a medium.
The heat radiation will not suffice to create the flash freeze that is described in SciFi films and literature.
Ie. Hollywood Myth.
Bart Bols by my back of envelope calculation it would around 1 hour for your body to radiate all heat such that its temperature is approx 0K. However you would be long dead by then
as soon as he said "that's cool", i literally went "oh fuck off joe"
damn the puns
For a video about science, it had a pretty huge error. In such space, you would NOT freeze/freeze to death instantly. At first your body fluids would likely go upwards towards your skin and you could flash sweat. This would cause you to feel a cold sensation, however there is nothing in that space that can take heat away from you. Without something to take your heat, you can't simply freeze. One would die though, but more from having fluids shot out, bloodvessels burst, not being able to breathe, etc.
We give off radiation.
+rogantu but also our heat will be suck out so there's no error
+Dean P. not that much.
+rogantu
he said almost instantly pay attention
Hi Cham Well, instantly means so fast it might not perceivable. If it's almost that fast, then it has to be so close that it's wrong.
I think this issue with this lies in the use of the word "heat." It's not heat, it is thermal energy, which is a neutral thing on its own. A large amount of thermal energy is perceived as "hot" and a small amount is perceived as "cold." Hot and Cold both do exist, just only as products of our mind. They are based on opinion.
That was a phenomenal way to describe it in less than a few seconds. Thank you
Crazy. We had this exact conversation as one of our car talks the other day. Awesome video of course.
actoutgames Awesome! I'm gonna assume Presley knew this front to back :)
It's Okay To Be Smart you could even say she knew it cold. *rimshot*
Wow you explained SO many concepts SO well in such a SHORT video. Maybe it's because I already studied these topics, but I feel that even if I didn't, that was such a well explained overview of SOOOO many things!! Keep up the good work!
You seem really proud of that pun at 3:05.
So if cold is the absence of heat then is hate the absence of love???
I guess it is
+Rizz922 No, without love you're just cold...
Nope, hate is the addition of anger to love or friendship... Ambivalence is the absence of love...
+Rizz922 in science there is no such thing as love,its just the brain releasing Serotonin and dopamine so that we may reproduce,
+Rizz922
dude love is opposite of hate, as an example if we took love as an attraction to someone hate is like running away from him (or throwing potatoes on him) but seriously your expression is like a huge mistake i mean like damn, it can take damn texas
"The universe is on a long slow mission to even everything out!" lol. I love that! So funny!
And true
Great video! :-D One small thing : the fact that matter stops giggling at absolute zero is the idea which was thought by Kelvin when he realized that the giggling of matter was linked to the concept of temperature. However, quantum mechanics has since shown that matter never stops giggling, even at absolute zero! If one were to reach absolute zero (which is not possible), matter would just reach a minimum of giggling whose energy would be determined by quantum mechanics and intrinsic properties of the frozen matter. :-)
Alexis Reymbaut Yeah I almost added a caption about quantum jiggling, but for exactly the reasons you stated I left it to "atomic jiggling" and decided to leave quantum effects for another day :)
Quantum mechanics always seemed funny to me.
It's Okay To Be Smart I can't wait to see that : you always do a great job! :-D
Penny Lane Because it is! In some sense... ;-) It's amazing to realize that the world is much more complex and beautiful than one can think at first, even at microscopic scale!
I giggled.
I hate when people throw around, "there's no such thing as cold, only the absence of heat!" like bitch, the absence of heat is the definition of cold. it's like saying there's no such thing as dark, just the absence of light.
TRU
There's a difference between saying there is no such "thing" vs saying there is no such word or concept.
Some Kind of Nice there is no such thing as dark
Some Kind of Nice ok first of all if u don't agree don't watch the video second of all were watching to learn and be corrected not to read someone's stupid post that ur making third of all he is a scientist smarter than I and u
M Scott alright doesn't matter how smart one my be. people can still make mistakes lol. he's not some almighty being that knows everything.
Your videos always fascinate me, keep up the good work 👍🏼
-1? rain ? cold??? its -20 here right now! :P
Martin Bigger I fully admit to being a complete weakling when it comes to low temps. That's why I live in Austin :)
It's Okay To Be Smart I've been to Texas. Anyone who claims they go there for a stable climate is a nut ball. Well below freezing at night, to sweltering hot in the day... that is a bucket of NOPE!.
I had to go over the intro at least three times because the terms "-1", and "cold" just didnt mesh in my head
In Tijuana we freeze at -3, I mean I couldn't even run, I couldn't move
*****
-300? i dont think we have a model of the universe with negative kelvin temperatures. but please inform me if u know of such a place.
"Its not cold, its lost of tempeture" my teacher use to say this alot, but then "but you know what? fuck it, you tell the person (give me a cold drink) not (give me a lost tempeture drink)" and we lought XD
"Cold" is a word of the humans for named "loss of temperature" but the "cold" not exist really as particles or something.
'Engel Aguilar' i know, thank you teacher XD
Cold is a perfectly correct word to use as an adjective. A "cold drink" is correct.
The only issues are when people use it like a noun. (Although even then it's splitting hairs).
Lol the next time i go to a restaurant i should say I would like my sprite with no heat thx
Amazing video! Got this randomly on my feed, and you’ve definitely gained another sub from it.
This video fucked up everything I ever knew.
haha ikr lmao
Shajuan Johnson lol tru
holyshit thats funny and I agree xD
Well to be fair saying cold air or cold temperatures isn’t wrong by our language definition but overall it’s just correct to say not as warm or not as hot which we simplified by just using an opposite word for hot
Its called Hoth but its cold there, so shouldn't it be called Colth?
Whoa. I'm like… just whoa.
What have you done?!? I just...wow. I don't even know anymore.
It's called hoth because the biggest thing the planet's missing is hot temperatures ScIeNcE iS a WeApOn Of SaTaN
*"It's Okay To Be Smart"*
For me: *It's Amazing to be Smart even though you keep screwing up on the test"*
This is a great video! I mean, i know about thermodynamics, but i wanted to see all the cute little jokes made within it! Well done!
that last part was poetic. Thanks for the perspective.
I study Biology in the first Semester, and these videos are (and i am not exaggerating) about 10x more interesting than everything we are doing. especially because here they are respresented in a way to make the viewer interested, unlike in university where everything is just read out loud....
2:20 depends on how big the kettle is, if you use one made for English use you'll likely get a different result.
Good video. Those ending statements are eureka moments I've had that you explained very well
I love you're video clips thrown in to simulate our reactions. Keep doing it. Hilarious.
Americans be like: There's no such thing as cold.
Canadians be like: Are you sure about that eh?
0:43 i thought i was glitching lol
I'm from Germany and found not even one video about this and then you came ....thankkk youuuu❤❤❤
did you just say you're cold in -1 c???? as a Canadian, i am APPALLED.
I love the video and the explanation, but let's be clear: cold does exist. It's just wrong to use it like a noun.
Cold is an adjective, and it's certainly real. I can feel cold exactly how I feel Warm, hurt, or tired.
In this sense it is a synonym for the word "hypothermic".
Yes it exist but not on its own
Here's the question that wonders me. Say, I somehow teleport from my warm--n-soft sofa to that deep space you mentioned, but somehow I manage to get into a air-tight space suit.
As you said at 2:45, I should momentarily freeze to death. But why?
There's so little matter around me to take my warmth away, that conduction will work very slow (the same thing happens with the thermometer later in video).
My body fluids cannot boil out because my space suit keeps normal pressure.
Therefore the only way I will really lose warmth is radiation which actually happens to be not the fastest way of getting cold.
That's why I think I'll manage long enough being warm, given a space-suit, to die from dehydration, empty oxygen tank or space radiation, won't I?
SilentLesch I never said you'd still be alive when you froze! Yes, in your scenario your air likely will run out first and you'll die from asphyxiation. You're right that you'd lose heat via radiation, which depending on how I've seen it calculated would take anywhere from half an hour to half a day to drop your temperature to "frozen" levels.
It's Okay To Be Smart hmm, that looks interesting. I thought it'd take longer. I'll try to make my own calculations then, thank you.
LOL at The Shining reference as an astronaut in space around 2:45. Jack, the crazy dad that froze, I'm sure its the same here.
This totally helped me to understand the laws of thermodynamics, thanks!
The example of the tea and the iceberg is just wrong. I could have a 800 degree microgram of steel and of course its hotter than a 100 ton iceberg.
Temperature and surface/volume are different things.
The larger capacity of the iceberg to increase the temperature of a pool of liquid nitrogen is related to its mass, not its temperature.
Put a 2ton 800 degree piece of steel and put a 2 ton chunk of ice (with equal surface volume) and check what happens.
Also, almost anything you put in liquid nitrogen will increase temperature of the nitrogen.
+Hugo Torres Now this is enlightening, thanks!
Wrong, degrees don't exist
Temperature and mass are related actually and including the period of time they went in.
With that hot temperature and a very cold surface it could blow up the tea out to the sky due to rapid increase of temperature.
And if you really listen to the guy, temperature is "a measuring of vibrating energy of matter"
so 100 ton iceberg is actually hotter in scientific term than 800 degree kelvin micro gram, I understand your point of view though.
Because that's reason why most people that went to listen some scientific conference they will get confuse because their "perspective of views" are different.
You don't really use term hotter but higher temperature, they might sound the same to you but no, they're not.
It's about the same to newton force, it's not like 3000 newton force can hit you harder than 10 newton force, you need to think about the surface area as well and that's called Pascal or (PSI)
No one:
Literally no one:
Not a soul:
It's Okay To Be Smart: Cold isn't a thing
Literally everyone: What on earth have you been drinking
Thank you so much for uploading this video. It is helping me get through the pandemic!
Thank now I finally understand the difference between heat and temperature
Temperature is just a measure of all that jiggling
So that's why boobs are considered "hot"
lol
dat Marky Mark reference.
lol why is this j in n the top of my comments list
@@FooxTru channel has more than 100k subs
Kevin Luo oh that affects it’s location in the comments? I didn’t know that.
When ur verified and get three likes
XxLunaNightgachaXx #relateable
1:59 Universe: It's mine mine mine mine mine
The end of this video was a neat way of putting things.
Idgaf what people say, Summer sucks. I hate summers and spring. Every year fall and winter can't come fast enough. It's so nice when the weather outside is nice and cool or cold. Summer just sucks bad. It's hot and it just makes you want to quickly run inside. At least when it's cold you can wear coats and wool hat.
Moneygetjealous oh yeah.
i hate the cold, pretty ironic since I live in Norway haha
It's so hot here in Australia, you literally cannot go outside for longer then 10 minutes under the sun it burns you
Cold sucks, i love winter, cause its warm inside and i can drink hot drinks and wear warm clothes and bundle up in blankets
When its hot you can only take so much off and even then you can only move your limbs so far away from eachother, and cold is slow to cool you off, and its not as relaxing as getting warm out of the cold.
you must live in Europe or Midwest... go to Alaska or siberia then we'll talk
3:47 he actually had hot tea, you can see his glasses fog
ha ha yh i noticed
Oh rlly...😐
I noticed
The Boogie Nights scene was perfectly timed 😂
So glad I discovered your channel :)
Why is that is I blow on a burning match It puts it out, but if I blow on a fireplace, it Grows
because wood is a good fuel source, so you can blow on it and it gets stronger because it feeds oxygen into it
Zane Orkenn yeah, i know. but why does blowing set off a match?
Péter Baktay
because the flame is too small so it can't handle wind from even your mouth.
Zane Orkenn I'll ask dad.
Péter Baktay beacause the fire needs more oxygen to grow beacause it has more matter than the tiny flame of a match with cant handle the matter of ur breathe
He sounded a lot like Vsauce at the beginning of the video
Love your channel and content👍
I told my mom about this channel,then i had to email her a link to the channel. But she loves it almost as much as I do....I guess it was worth it.
I really don't like how you used the example with kettle and Iceberg. Heat and temperatures are two different things. When you ask which is hotter, everyone would assume you are talking about temperature. In fact, that's our perception of hot vs cold. The iceberg does have more heat because it's much bigger mass (Higher overall energy, potential+kinetic), but the kettle have much higher average kinetic energy and therefore it is still hotter than the iceberg.
jiangx18 That's… sort of the point of the example.
3:50 I hate that shit
You don't lose more heat to "dense" materials necessarily. You lose more heat from the product of density and specific heat.
One of your best ones!
Pls universe steal my kinetic energy here in Puerto Rico it's 95°c i need help my fan doesn't even do anything anymore.
excuse me... 95C*!!? wait WHAT? do you mean Fahrenheit? because 95 deg Celsius is hotter than 50km above Venus' surface and almost enough to boil water at your 1 bar.
95°C?!!?
zero kelvin nearly impossible
Love this channel!!
Those baby bears face-planting into their mothers footprints is too cute!
Wait, You're telling me its got nothing to do with phlogiston?
Scientists are still working on extracting it from the aether, unfortunately
Am I the only one who felt awkward when he blew on the tea and his glasses fogged up. Acknowledge it!
Love this episode
3:46 I love how you know thats a real cup pf tea cuz of Joe’s glasses fogging up
if there is no such thing as cold then how come my mom makes me wear a coat
Because she don't want your precious atoms to stop jiggling x)
LOL LOL LOL.... OMG.. I laughed so hard just now. Lol. *sigh*. Great comment :-)
@@Erobazai And I don't want her's to stop jiggling either ;)
Duuuude, you have totally misunderstood it - just because it is relative and subjective doesn't mean it doesn't exist! When people say I am cold, they don't mean that 'cold' is a substance, who on earth would ever think that? People are obviously referring to the sensation that they experience! Therefore cold exists - it exists in our minds, just like all the ideas, feelings, emotions an so on.
Also, when you ask which one is hotter you are obviously not referring to the heat because hot and cold are not physical measurements as you yourself explain it.. you are referring to the relative feeling one would experience, so you are asking about the temperature and obviously a boiling tea kettle has a higher temperature, therefore hotter.
You should really choose the way you describe and name things differently in order to be scientifically/logically correct.
I am not disliking your video as I love what you do, but I am disappointed about the fact that most of the people will be convinced by your video that cold doesn't exist - which is total bs.
have a nice day!
True, BUT, what he is referring to is, when people say you are letting the cold in... Is incorrect. A mass of cold air is pushing the warm air out... So, a better saying would be: you're letting in cold air, pushing out some warm air.
he just explained the physics of it chill your titties
R D P I agree with you 100 % very click baitie title
thanks
Cold exists in the heart of those who have lost their soul, danmed forever to protest without alternatives, accuse without facts, and fade without shining. Cold is not physical, but beneath this world of light. Like a mind conditioned to reject reason.
Ok. This is what gets me crazy. If we "feel" cold when we transfer our heat to another media and, considering space is mainly empty space. If you are in space with no suit, even you are near to absolute zero, you would hardly notice it. Since you are very slowly radiating, right? 😮
Said it before elsewhere, I'll say it again here:
Fahrenheit is better for humans and basic weather, celcius is better for scientific measurements and water.
0F is an intensely cold day. 100F is an intensely hot day. A nice scale, 0 to 100. We survive pretty great at areas in this range. Getting too close to or stepping over those boundaries is not good, but we can edge up without too much issue. Best near the middle, with variance based on preference, and moves from near one end to near the other in most temperate places.
0C is kinda cold. 100C will result in the death of humans and animals. -18 to 38 is freaking weird. What the balls, why would you use it unless you're talking science.
K
+Joy Baker Because with so much water in the world, 0°C is the most crucial value. Will the road be frozen? Will it snow instead of rain? Can I put a bottle of coke outside to cool it down?
0F and 100F are still totally arbitrary and tell you nothing about the world. Kinda cold, kinda hot, who cares?
oh, americans...
+Joy Baker Really, I prefer Celsius. How did my countryman Fahrenheit find out about 0 F? It was the coldest temperature he could make in his lab. Celsius stated 0 C is the freezing point of water. Handy in winter, so I know when to expect black ice. Basic weather? -40 C and below = extreme cold. -40 to -20 C very cold. -20 to 0 C cold and freezing. 0 to 10 C winter temps during the day here in the Netherlands. 10 to 20 C spring and fall temps. 20 C and higher summer. 30 and higher tropical/ desert daytime temps. So simple.
+Joy Baker What you're saying makes sense, I guess. But it depends on where you live. Where I live, -18C is unheard of and 0C is an unusually cold winter's morning so Celsius works better for me on that end. Plus, the reference frame of freezing water being 0 coupled with the knowledge that room temperature is ~20C, it's just as easy to understand as Fahrenheit.
That is weird... I just learned this yesterday in science class
Very cool and fascinating !
Omg I know that park in the "I'm from Texas picture" I go there every 2 weeks!
Learned this in science. If they just showed this video they could’ve saved a whole unit
This just adds to my existential pondering.
Good video, I understand! It makes sense and all but...I live in Quebec and when its -20celcius let me tell you that there is such a thing as Cold!
Same can be said for shadows. You cant 'see' a shadow, because its not actually there.
Loved this.
*waits*
...
*waits more*
...
Uh..
*waits some more*
...
*decides to say it anyway*
...Because science?
I recall that song from _revenge of the nerds_
"I'm no jock, no football hero but that doesn't mean I'm −459.67 degrees Fahrenheit"
that spring with the picture the place is called barton springs its a part of a river that is a pool. It is in Austin ive been there.
So good thanks
I watched this video YEARS ago and this confused the crap out of me! Buy I understand it now!
Your videos are amazing!
THIS IS SO INTERESTING! I wish I could retain all this information hahaha
So if cold is the absense of heat, and quiet is the absense of noise; then we can cancel heat like we can cancel noise with noise cancelling headphones.
We can advance Air Conditioning from refridgeration cycles transferring heat to a magnetron vibrating "anti-heat" to cancel out the heat. Such an appliance will take much less energy to cool us down in summer, and be much more portable than Air Conditioning is today.
That "which is hotter" question...I couldn't answer it because I was busy dying
Your videos are amazing.
that glass steam thing was funny. light joke
love you and your channel
When he made the hole screen jingle I thought my screen was glitching 😂😂😂
i’m glad you qualified that you’re from texas because i was about to say -1 is not cold at all
0:29 triggers me in the first 30 seconds "-1 and it's pretty cold" meanwhile I'm here with -30 to -50 with windchill and I just triggered someone from Antarctica
My new addiction channel 😍😍
I gotta watch these when im high one of these days lol. I'd be sucked into the coolness xD
Your endings are awesome
The same goes with "hot". Both hot and cold are relative measures of temperature. To say that something is hot or cold, you have to say relative to what it is hot or cold (and normally we put that reference in ourselves).It is the same deal as light or dark, or fat and thin, and any retalive variables.
Wow I just learned more in five minutes, than I do in a week in school !! And he made it interesting as well !!