The Physics of Heat: Crash Course Physics #22
ฝัง
- เผยแพร่เมื่อ 7 ก.ย. 2016
- Have you ever wondered why we wear clothes? I mean, beyond the obvious. Why does wearing a jacket in the cold keep you warmer? What is happening to all the heat inside your body? In this episode of Crash Course Physics, Shini talks about the physics of heat!
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Produced in collaboration with PBS Digital Studios: / pbsdigitalstudios
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Hi
After that intro, I expect these comments to be civil and respectful.
Great video as always, Shini! Thermal engineer here. Man, you went through basically three semesters worth of thermo & heat transfer in the last three videos! Isn't this your sort of intro to physics series? We didn't cover some of this stuff until second or third year of undergrad. Anyway, keep up the good work!
You guys should do crash course math
yeah please
Agreed
7B17 Chun Kit LAI
But then you realize this entire series is math but useful
Ya please
Maybe crash course algebra?
The lightbulbs fall neatly on her head and shoulders. This is quite satisfying.
The real reason for wearing clothes is social convention. In warm climates, it is not really necessary.
Kinda necessary for other reasons. Sunburns aren't fun...
I disagree. Cloths are a critical piece of creating a micro climate for your body. Without this control, in hot or cold weather, you could die from exposure in 3 hours.
Of course clothing style has become less and less driven by function.
+Quentin Lightner where it's warmer people have darker skin and don't get sunburns.
+Josip Broz Tito so my Lily self should stay in the shade?
+vitamindubya For the sunburn reason alone, yea.
damn you just went through the thermodynamics of my first two years of college in a 10minute video
Yeah but we who havent had this in our subject at school are really confused. But might be just my school that was terrible at teaching us anything.
Thank you so much! I literally just watched 5 videos and learned more from you than my actual professor! He's great, but you provide examples that apply to everyday life so it makes more sense to me! Thank you, I feel way more confident for my last midterm now!!!!!
I loved that episode, congratulations, I am studying thermodynamics and things related to heat and temperature, and that episode helped me a lot with this, so thank you VERY much Crash Course, and thank you also Dr. Shini Somara for your great host-work, you all are amazing.
since I'm possibly the only serious person here, I'll share what I learned today.
1.Clothes have a reason (I wasn't so sure)
2.I suck at Physics
and
3.E=mc2
Thank you much appreciated
What about nude beaches?
mc²
This video has given me all the answers I needed about heat and heat transfer. Thanks a lot!
This helped so much!! We just did this in chemistry and I was sooooo confused!!! Thank you!!
10 minutes videos that take 100 minutes to study them.I love these.Atleast they make things clear!
That was quite an interesting , informative video , I loved it it was fun to watch and it made my thermal energy exam preparation easier so great thanks for sharing such good content ❤️.
Very simple explanation..... U guys r the best...... Thank u so much
Excellent job Dr.S! Thank you.
About to write my phy exam! You helped me more than my teachers and all the books! Thanks a lot! Love you!
i like how crashcourse draw their heat diagram to scale
Very interesting, thanks for uploading. I learned a lot. 😊
Thanks for uploading, from Japan.
Wow. What a mouthful of a video. Great job!
About the losing heat from not wearing clothes, I've found that to be true only temporarily.
Turns out that the body adjusts its own temperature, as long as it isn't too cold. I've been just as warm naked as with a sweatshirt.
Thanks for this awesome video.
Great course , its always easier to digest when you already have applications
I could follow this one better than most others. Thanks!
i love this series
Loved the examples of conduction and convection
Well explained! :D Thanks😄😄😄😄
This video is mind-blowing 🤗
Thank you again crash course
thank u shini!!! great physicist
i love this teacher.....:)
Man I love this channel.
I remember emailing my professor asking this exact same question
I knew there must be a more sophisticated answer to it
That it is a very amazing video, I am so glad I found the answer that satisfies my curiosity for learning Thank you very much
Thanks - a lot of information. Good video, I appreciate it is a crash course. 2 Parts slowed down would achieve a better retention, great use of animations, shame they weren't used to answer the question on which the video was based, as that would seriously hit home all the learning points. Thanks.
THANK YOU VERY MUCH!
Omg I'm excited
Man, we've been dancing around electromagnetism. We talk about waves, then move into energy and heat, with a slight tease about photons. We talk about heat and tease about blackbody radiation, and then we go into thermodynamics.
so clear
"Heat"
"Naked people on thumbnail"
Oh.. you meant... you meant the physics definition of heat. That makes more sense.
I wanted to ditch my business management course and do physics because I never realised how much I loved it till now.... but I can't do the math? Are there any more accessible channels out there for me to study it maybe on my own? Something with a slower pace maybe? Thank you for the content. It's so amazing what you guys are doing. Keep up the good work!
Azani Azman khan academy is good... They ask you questions throughout the information as well as provide great videos
Hi, I personally began my math journey from Math Is Fun, then I went to Khan Academy and after I started to prepare for science tests I found Brightstorm (they have math course and it is really descriptive and easy to understand). and maybe Krista King (She doesn't really explain why, instead she just shows how.)
Very interesting! I enjoyed the explanation! 👌
I'm sad that this series isn't getting more views.
because the majority of people don't understand what she's talking about
including me :^)
Wait for May and AP testing
That is because she is not presenting it in an entertaining enough way. They ruined Crashcourse Physics for the sake of political correctness. There are hosts that would have been far better at this, but they didn't do the course because they are white and male.
Sayuas I knew someone would say this. Check out her credentials.
"She has a PHD in Computational Fluid Dynamics from Brunel University London.
By the age of 25, Somara had completed her doctoral thesis while working full-time as a mechanical engineer.
She also has a degree in classical ballet from the Royal Academy of Dance
Shini’s recent work includes projects for the BBC, PBS Digital, and the Dyson Foundation.
Previously, Shini hosted TechKnow for Al Jazeera America as well as working for networks such as Sky and Discovery.."
Besides being a manosphere douchebag, what have you achieved?
nice comprehensive explanation
0:38
1:49
5:49
Excellent
Crash course math, pleaseee!! These animations help a lot to visualize the content
I thought it was so cool to see how temperature increase affects each element on the periodic table. if it gets hot enough, then every element turns into a gas
Nice I love that you teach
much better pacing in this one than the one on music.
Now I know why i got a D in thermodynamics in Uni .. I didnt even know the difference between temperature and heat XD
😂😂😂
Fantastic!!!
Know what"s hot? An adjective. Do you know what heat is? A noun. Know what Linguistics is? Something that Crash Course should do a series over. Also geography... cuz the G science is dope, and incredibly broad.
Like.
MY!
LEXICON!!!
generally great video
Fantastic explanation! My physics teacher wouldn't do it any better!
I actually don't need clothes, I've got my mixtape to keep me warm. I get burnt sometimes but it's not bad.
great video
Please do a Sociology and an Art History crash course!!!! It'd be so fascinating!
this was real nice
my 3 hour lecture about heat is explained in 9 minutes. Neat!!!
The Physics of My Mixtape
Is it fire?
This is the hardest I've laughed at a thread of comments in a looooooooong time. Great work here.
This is whole thread is gold.
+
+++
Smart is hot.
Being gorgeous is too of course.
that is a dude. look again.
@@eyesea123failed trolling ma dude.
@@anjayl okay, if you think so. Yikes.
very nice work should get more ciews
she is rapping as fast as emeinem
You guys should do more physical experiments and demonstrations on camera. Just talking about it, showing formulas and some animations in between isn't enough.
Not enough for physics at least. It works better with economics philosophy and world history
+
Btw I tend to clear all the questions school leaves here on youtube (or internet in general, but mostly youtube) but most of the people at school dont lmao so the only option they get is to cheat their way through school, I''ve done it too, because sometimes even teachers become obstacles instead of being our guide through knowledge, and I get it teachers do not represent 100%. But cmon man you get the point
"snicker" and here is where all maturity goes out the window, so to speak.
Oh man... this was complicated
Ooooh okay, i learned something today. Specific heat, thatls what i was wondering about today. Interesting
nice video
For the equation for the heat transferred by conduction, Using L to represent the Distance between too points would make it slightly easier
But clothes kind of do stop radiation, at least out of the human+clothes system. Any radiation from the body goes into heating the the clothes, this heat then needs to be conducted through the clothes, which have low conductivity, before being reradiated.
Then there is the heat lost by evaporation. Clothes tend to trap a humid layer next to the skin lowering the evaporation rate due to the increased partial pressure of the water vapor.
cool thank you
The physics of heat presented by the hottest host they got.. Niiiice.
nice
You clearly haven't watched crash course games yet. :P
yeah that scraggly beard is kewl
Lol 1/10
Or philosophy.
On a sunny, warm winter day, the chill still felt is due to the Earth not radiating as much heat as it does in the summer.
Please do Crash Course Anthropology!
John has said they will do it.
Man these online classes are getting harder and harder to keep up
What editor do you use? BTW Thankyou! This really helped me :)
What type are those lightbulbs in the background? They look really nice.
I followed her advice. I watched this video while naked...
In the interests of science.
I bet he cranked up his thermostat just to cheat!
At the end she said keep your drawers on, lol.
i wonder if she reads comments like this and thinks to herself.. wtf
IO Gaming Must have gotten erection, of course, due to cold.
I finally understand the latent heat. So is there a specific spectral range around infrared that has a universal effect on all matter to increased its temperature/thermal energy? How does this relate to the phenomenon of water heated by microwaves? Does spectral range of "heat-via-electromagnetic waves" extend to microwaves? So different compounds are differ in sensitivity within this spectral range do to how they resonate with a particular wavelength? It's almost embarrassing that "heat" still trips me up.
It depends on the quantum energy levels of the substance in question. Every material has a set (not a range) of specific wavelengths it can "deal in". On the atomic/molecular level there are many different ways for matter to store the energy it absorbs, and each of these corresponds to one "slot". Low-energy waves like radio waves typically don't have the energy to fill a "slot" and so pass through or get reflected. The slots created by many molecular bonds happen to fall in the infrared/microwave range. If something gets really hot though, it starts using electron states to store energy too, and they give off visible and UV light when they fall out of their slots. Energy can even be stored in the nucleus, but it takes even higher energy to fill those slots, like gamma rays.
Microwaves specifically put their energy in the slot made by the water molecule's H-O bond. The wavelength of the waves is adjusted precisely so that the photons are just the right energy level to fit in that slot. The interiors of microwave ovens are then made in multiples of that wavelength to create a standing wave inside.
+Rhaegar19 Thank you very much for that detailed description. That helps clear up a lot of my confusion.
temp is avg kinetic energy by each molecule and we measure it in deg Kelvin but Internal energy is also addition of kinetic energy so why do we measure Internal energy in Joules ? Inspite we should measure it in deg Kelvin itself.
That screenshot slayed me.
entropy is found within all things
Crash Course should have some sort of linguistics/languages courses! That would be awesome!
Question for the part describing Radiation, as an Example if the walls are 50F and I'm 80F, will my radiation slow down once I ( in this example at least ) and the walls reach the same temperature? A sort of equilibrium between the temperatures, or is it that an objects radiation is independent of the surrounding and not influenced by any sort of trading of our "heat" to balance out an area in close proximity?
Also thanks for the video :D
You won't stop radiating until you reach zero. The thermal equilibrium won't stay because the walls will continue to radiate heat away to other sources as well.
What about sublimation in regards to all this?? Would like more of an explanation on that one please
Watch the video before this one.
+Rhaegar19 ah ok, thanks
If you are into outdoor camping you should learn this
She is so stunningly gorgeous
Having watched this enthralling crash course episode I've been able to calculate that if the temperature of the crash course studio were 2-3C warmer it would completely negate the need for clothing altogether! I'm also happy to contribute to the heating costs ;)
wow
Nobody gave me explaination like this 😭😭😭. Thanks.
(7:28) i love how she says my name
Is the formula for convection the same as the one for conduction? you didn´t showed us the formula for convection, how does the formula for convection changes in comparison with the one for conduction? Thanks
Watched this for science class right after hearing a song about Dopamine, nice.
And this is why the level of nudism increases as external temperature approaches body temp. (37 C) (remember kids, sun screen is important)
love your videos... the animation, effects and the clear voice.
but please just try to speak slow, so we could understand more better :D
Very nice video.
Although I do have a question regarding the graph at 3:50. Probably I've overheard something but can't you feel a differene between water that's 20°C and 60°C? It still has the same phase yet the graph implies that the temerature stays put until the next phase change.
The temperature stays during the phase changes at 0 and 100. At 20 and 60 the water isn't changing phases and the temperature is increasing. You can tell the difference, 60 is hot. The graph shows this by continuing the increasing slope during this section.
this might be a silly question so sorry in advance. so is heat and thermal energy the same or are they different
Technically, wouldn't your body be losing heat to the air solely through conduction, while it's the atmosphere around you that transfers heat through itself through convection (which, as you mention, maintains the high temperature difference between your body and the air immediately surrounding it, sustaining higher levels of heat loss through conduction)? Or is there some mechanism by which your body exchanges molecules with the environment, thereby losing heat through convection as well?
omg the opening XD
You should make geology videos