Thermal conduction, convection, and radiation | Thermodynamics | Physics | Khan Academy
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- เผยแพร่เมื่อ 22 ก.ค. 2015
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Fire as thermal conduction, convection, and radiation.
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At the end there he just casually mentions how he witnessed a burning car exploding like it is a totally relatable event we all have experienced.
Hahahahaha
Nice one i must agree....(not relatable) really nice to topic discuss (makes mine craft villager noices*)
hm yes, I too have died several times from car blasts. Happens all the time
@@tecno5695 lmao
oh haven't we?
This guy deserves a nobel prize for all the exams he’s saved
YES!
You deserve a Nobel prize for having my favourite Pokémon as a profile pic
DUDE absolutely
dis guy need to be in the in the book of world records
Who is watching in quarantine 2020 for home school??
edit: yeh guys 2020 is almost finished my test is also done XD
yeah me
same bro
@@Daddynando_06 good
Me too
Me, preparing for physics finals
2:42 AND AND AND AND AND
LI YAN YUET omg you notice I died in that part
Y do I need school if we have this
same
Fred Yan lol
Good question.
haha
This is a good start but the right teacher can help you connect the concepts to real life.
This guy teaches so well, he should have a website of his own where he teaches every subject in school.
he does
Who is watching this at home becase coved 19
woah guys coranon virues
THIS GUY IS THE DEFINATION OF TRUE TEACHING . How clearly did he explained this mannn i was looking up the whole youtube for such kinda explanation coz my teacher didnt gave
Let say I am boiling an egg.
Heat from stove flame to pan = conduction
Heat from pan to water = convection
How about heat from boiling water to an egg? It is a conduction or convection?
I hope this guy goes right to heaven (if it even exists) when he dies
i hope he doesn't die at all
Of course ot exists
8
I love his voice for some reason
Amazing, I have never thought of the flames from this point of view!!!
This guy is awesome but i have a question when the flames of the fire are high why do they disappear❓
Sal you are so right! I HAVE heard the word "heat" many time in my life. You must be psychic lol! Thanks for the video too; I love your work
Please upload these videos to the Khan Academy website!
I like your sound man
lol what does sound have anything to do with this
Way of saying too
Lol
wow! this helped me so much more than other videos
Thank you, you are the best teacher in khan academy!
I'm new to this channel. And I subscribe after watching the videa for a minute. Good Job man!
This helped so much thank you !
i got an A because of this vid
hopefully, I can get it as well
Assignments are literaly makinig a question that this video answers completely
Perfect
Your handwritng bruh GOATED
*someone*: quiet possibly died infront
of sal.
*sal*: ELECTROMAGNETIC RADIATION
He writes so good with mouse
nice explaniation man i understood how the heat get
yep
2:43
and,and,and,and,and🤣🤣🤣😂
@Fred Yan
Same!
Hey can you give the Stefan-Boltzmann law???
i love how they've good handwriting on a computer mouse
Just use he ffs
Great video! It makes simple and easy to understand... i had this kind of video, try to watch for your additional references...
helped so much thank you!
we hate Watford
Excellent tutorial..!!!
can led lights also be called kinda fire?
😄 Thank You So Much for your help!
Thank you so much
I love his explanation
He had saved me
0:47 fuel for our fire
Thank you. Just. Thank you
Thanks for this series of programmes. I decided to watch this one while I was drinking a coffee I'd just made. And all of a sudden I got confused. I wonder if you can answer this question.
Why did my coffee get colder when I blew on it? It doesn't seem to be conduction, convection or radiation.
My breath is at, I assume, body temperature and blowing on the coffee eventually get it below body temperature.
I'm sorry if I'm being thick. Even after getting the boost from the coffee, I still couldn't come to a decision.
Derek
As stated in this video the particles with a higher average kinetic energy are higher than particles with lower average kinetic energies. This can be applied to your cup of coffee, the particles at the surface of the drink have a much higher kinetic energy(you could say hotter than the particles underneath), when you blow on the drink you give those particles just enough kinetic energy to leave the liquid state, this is why when you blow you can see large amounts of "steam" come off your drink, when you do this the high energy particles are leaving your drink leaving you with the cooler more dense particles underneath with a lower kinetic energy, hence your drink is now cooler
Thanks for that. It is a very clear description.
Harvey Yates No worries I've got an Exam tommorow so its good practice :), oh by the way, thats why if there is wind, your wet cloths can still dry on a cold day. Remember this is evaporation not vaporisation. :)
i thought your name was harvey
Hmm....
Thank you so much you helped me 😄😄
good summary, but @ 7:10 ... the blue light is emitted because of chemical reactions and not because of incandescence. to see incandescent blue light from an object it has to be around 10000K. When a flame is blue it has around 1000K. The flame is the hottest where it's yellow-whiteish which is around 1800K...
ok.
@JZoidberg can't tag u for some reason So yea here is the answer to what u asked:It doesn't exactly fall as a blob and while explaining u can't draw arrows for each n every molecule that goes beneath the less dense molecules.its simple:when the molecules at the bottom heat up they become less dense- meaning lighter; so each molecule which is lighter, makes its way upward and as u might know that there has to be something(molecules/particles/atoms) as the bottom cannot be left without anything(the warmer/less dense molecules have moved upward yea?) so the more dense molecules- meaning the heavier molecules move downwards not as one whole but as separate molecules.its kinda like common sense: U are holding two balls in both ur hands one of them is heavier than the other one so when u hold them out the heavier is gonna make ur hand move downwards, yea?I hope I didn't make it even more confusing for u
What makes the molecules less dense when they are heated?
@@AtEboli Heating them means they will rise, so in turn the other molecules around it will sink as they r less dense
you are a amazing teacher !!!!!! thank u
0:26 All at the same time 🤓
What is heat radiation and is it like electromagnetic radiation? Heat can transfer in vacuum also but how? When anything is heated then its molecules vibrate rapidly but why anything that comes near that object also heats up? Is it something like electromagnetic radiation?
Understood yeahhh 😀
1:27
does your teacher keep saying um? like if they do =)
--um--um--um LOL XD
Nah she always says
"you fools "
AHHH I totally get!!!! Thank you, Thank you!!
I think the description of electromagnetic radiation is misleading. It's described as if it comes out of nowhere out of nothing, but it comes from a photon, whether the photon is visible or not. Many examples of electromagnetic radiation are given. It seems more intuitive to describe radiation as movement of matter by photons, then describe examples where distinct parts of the electromagnetic spectrum clearly emit energy that heat things up, even though the divisions of the electromagnetic spectrum, I think, are somewhat arbitrary. A microwave is a great example, particularly because it seems to not involve convection or conduction and is not visible light.
Also, pointing out how radiation is also an interaction between particles makes it seem less weird and less magic. Because it's neither weird nor magic except the part about the photon not having mass, but you can leave that out.
>The air
>The cooler air
Yay khan academy guy
Basic modes of heat transfer- conduction and radiation.
Thats crazy
My 5th grade son is falling asleep.
NICE !
Helpfull for my sons
He sounds like a doctor
Well I have a test today for final exam
And if I pass,I will comeback to subscribe!!
Edit:Passed subscribed
the comments section tuned into to ''thank you for making this video i had a test today'' to like a classroom like ''sir may i know why yaytayatyata'' to like memes in the chat
Thanks
dat is sum good voice
why does the dense area 'fall' as one blob when it's made up of individual molecules?
Maybe because their density is decreasing at the exact same rate, so they will drop at the same rate.
assmane999
assmane999 k bahd
Land breeze and sea breeze is example of WHAT , Convection or radiation ???and how
Convection
Thats Good
amazing
helped me in school
hello
please comment
i literally sleep in class n understand whatever lecture given by the teacher through this stuff
same here
hahaha
👍
Bro what song are you listening to?
the way this guy talks reminds me of markiplier, is it just me?
5:01 atsuyo masiyoyoi
that dude has a lot of subs
that`s so strange because this theory is more complex comparing with the true theory of conduction and thermaldynamics
thx so much!!!
online learning/ Khan acadamy
after 10 hours of searching videos of conduction, covection , and radiation i foud a video i could understand the other videos were hgejuewrfhrng4gtferhndcuj6785345rfhgedvnu‰ouirh like this . 😂 i have exam tommorow he really saved me
Really, why does it seem like I am always hearing the same voice teach on Khan Academy.
I always use your website
Lol
amazing !!!!!!!
Calgary Atrs
very useful
2:43 to 2:44
why does he sound like jshlatt?
Nice
2:43 and and and and
Why am I watching this?
This video is a great example of a fluency disorder. The video would be a lot shorter if he didn't repeat himself and stutter.
More like it
I think I just let out some hot air
(me)
First
No no no don't be that guy
U mean last?
Maybe i'm too young
we we we lol
Wrong I’m the best scientist
me so boring