Heat and Temperature

We all know what it's like to feel hot or cold. But what is hot? What is cold? What is heat? What does temperature really measure? Don't pretend like you haven't lost sleep over this. Well you don't have to fret any longer, Prof Dave will take you through the details.
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[@professor_m_gibbons]

@3:03 - the transfer of heat energy will NOT always alter the temperature of a system, such as when a phase change is occurring at a constant pressure. Very common misconception, so watch out.

[@ProfessorDaveExplains]

Yes good point, that was a misspeak on my part.

[@professor_m_gibbons]

@@ProfessorDaveExplains It's true 99% of the time we're talking about solid objects though, so I understand. Thanks for the reply!

[@10anjalinarayan60]

@@ProfessorDaveExplains u can pin her comment

[@localverse]

@@professor_m_gibbons Does that mean the heat's energy temporarily stops going into kinetic energy and instead goes into breaking bonds at the instance of phase change (with constant pressure) then switches back to affecting kinetic speed of molecules after the phase change?

[@smaran353]

One question: Isn't the expression "heat flows from" misleading and incorrect? Instead, the expressions "thermal energy flows from" or "heat flow occurs from" are actually correct, isn't it?

[@morrainn815]

man,,, this dude really be saving my grades. thank you professor jesus

[@samyukta4746]

jesus😂😂

[@kingboi7856]

jesus LOL

[@leagodalle995]

yooo look at the top of his head!

[@dalemalunes1100]

Wtf QHAHAHAB

[@AnthaxPhotoworks]

Hello

[@alias40anon]

Excellent short and simple explanation.

[@pritchardsangai3288]

I love the explanations, thank you very much.

[@kedarparab8001]

Man you actually explained nicely and scientifically than other videos

[@jorostuff]

I love when he says: "Let's check comprehension." I LOVE IT!

[@Jen-gl1hn]

Ikr!! Like it helps me a LOT

[@vivianasierra1]

thank you I needed this video for my end of the year test!!! :)

[@aedenthegreatyt]

My Chem. Honors teacher had me watch this video for an assignment. I was not disappointed.

[@chrispieG]

Professor Dave. You're the man!!! My Gr. 10 class finally gets it.

[@SW-nx4jz]

Omg your the best! Thermochemistry is so confusing to me but your making it alot easier. I can't say thank you enough for these quick video!

[@paramitam4002]

teen Titans go
Can we feel temperature
th-cam.com/video/sKhcal1AbIg/w-d-xo.html

[@ShyaMKumAr-bo1ji]

*GREAT EXPLANATION* 🙏

[@voltdragneel1052]

after 10 hours I have my chemistry test and I was reading thermodynamic when I see notification of your video lol and yhea you're videos are useful

[@ProfessorDaveExplains]

more thermo all next week!

[@prisminc158]

Is that Kaneki/Haise?

[@controlequebrado4455]

your*

[@joserobing661]

Thanks for your clarity of ideas and simple presentation

[@aedenthegreatyt]

Any hard science concept: *exists*
Dave: *Understandable, have a great day*

[@retsepilemothepu1396]

My Physics improved from 50% on semester test 1 to 97% on semester test 2🎉🎉
Thank you sir, I have nothing to offer. I’ll thank you properly in the future.

[@eyobwendmagen849]

I rely understand Difference of Temperature and Heat. I like your explanation system. It is easy and nice.

[@subhashishbehera2424]

Sir you're explaining things really good

[@mohammadhafeezullah1846]

thanks for my completing the first question of my assignment

[@jilliandavenport9404]

Taking my last CSET and need to know this info. Clear ,concise and very helpful! Thank you!

[@fooliery6216]

I ended up here after watching the first 4 videos in the "Math and Science" channel -chemistry 1. It become paid to see at the same point where Prof. Dave here pics up the topic. Thanks for not making me Pay to Learn Dave. I wanna learn for free

[@howitzerm777]

i just saw the intro and was instant subscribe push!

[@crazygamers9574]

तुला जास्त येतय का वेड्या

[@po4187]

wtf his intro is cringe asf

[@carolarentz3208]

Thanks so much for the video it helped A LOT!!!! :)

[@niceguy4801]

Thankyou professor dave!

[@danielcastagna1941]

Thank you so much Dave Grohl \m/

[@rajpanigrahi7008]

Hello Dr Dave... you explain everything in very easy way, so anyone can understand it easily...I am the first to watch and comment on this video.

[@shirohanna]

Great video and visuals. Thank you!
Follow up question:
The high specific heat capacity of water is due to strong covalent bonds of Hydrogen and Oxygen molecules INSIDE each water atom? Or, strong bonds between water molecules?
Thank you, again!

[@kevinlapulapu8651]

thankful for your lecture

[@raedibrahim9409]

I love your lectures 😍

[@user-fi8pi3eo5s]

Great explanation!

[@binadam9459]

I love you man, you are brilliant

[@oliverbrunncarstens4215]

Thank you Dave!

[@hari8654]

Thanks you sir most conceptual video

[@katrinamae3510]

The song at the checking comprehension is so calming lol

[@hindutva2685]

Outstanding explaination sir

[@Ethan-uo6fv]

2:22 Not all phases of matter expand with higher temperature. Water for example, is at its densest at 3.98 ⁰ C (according to the internet). Contraction upon heating in solids is called "negative thermal expansion."

[@WaseemKhan-hv6np]

thank you sir

[@SamiUllah-bg2br]

You have no indeed explained it very well sir

[@user-dg6lo9fn8u]

Thank you sir!

[@carolarentz3208]

YOU SHOULD BE MY TEACHER!!!!!!!!

[@ahappyimago]

U da man, dave!!

[@cbtaylor303]

I have a question that has troubled me for some time (making the link between the atomic world to the macroscopic). What happens if we have a spaceship in outer space, and let’s say it’s a perfect vacuum (so no friction will occur). If we accelerate the spaceship, it now has higher velocity and so higher kinetic energy. You could say therefore it has higher temperature? After all the average kinetic energy of all the particles has increased? This doesn’t make sense though. Is temperature relative? Another similar problem, say if the earth sped up due to a gravitational force, does that mean our individual temperature increases, after all our kinetic energy has increased.

[@kurage_medusa]

Kinetic energy is based on velocity and velocity is relative, so temperature is too.
If you accelerate an object in space relative to something else, I believe that it would count as increasing the average temperature of the system, as there would be more kinetic energy available. It would not increase the temperature of the object itself however, since relative to itself the average kinetic energy of its particles is the same.

[@nirupamam2814]

All of your videos are very very very very nice....

[@abutaymiyyahlectures]

this lecture was mind blowing ngl

[@binabonmary.marbaniang6456]

Love the explanation👍👍👍

[@abdullahalhabsi9302]

I have an assignment due next week hope similarity doesn’t go high 😅 thank you professor

[@richardfraussen1057]

Wish I had professor Dave videos during my studies, 55 years ago.

[@ghazalabibi9570]

@Professor Dave Explains I love all your highly educational videos that you do here on TH-cam. I have a question! How come cold temperatures have a limit of around -273 C and warm temperatures can go well over 10,000 C or even can be over 1 million degrees? Please explain - THANKS.

[@ProfessorDaveExplains]

that's absolute zero! a total absence of kinetic energy

[@kotishjaiman8231]

Just like you can take away only 1 liter of water from a 1 litre beaker but you can keep adding water to it eventually leading it to overflow and you can still just add more. Atoms have a definite amount of energy so you can take away only that small amount, whereas you can give it a lot of heat but after a point its structure will be affected maybe bonds will break (in case of molecules) and after a point you will get plasma.

[@ghost-pubgmobile]

Wow thank you so much!

[@brianfrancis5548]

"all phases of matter expand with higher temperature"
actually not always true. the density of water decreases as the temperature increases from 32F to 39F

[@littletin8453]

the intro is the best i have seen

[@incrediblestudios5609]

I love you Professor Dave

[@Meringue_Pie]

saved my life and my science test, thank you

[@abrarmohammed6735]

Thanks 😊

[@lowall]

i like very to the point and easy to understand :D

[@geramaerosales572]

Great Video! very useful as a resource material

[@Jihad_Sakib]

Man, your are so amazing 💗 , thank you 😊

[@bellaferreir6732]

UR THE BEST!

[@ProfessorDaveExplains]

you are!

[@ohmy9261]

You're the man dave

[@kabouch]

The covalent bond stretching and bending is an example of potential but not kinetic energy, am I right?

[@rekhadevi9672]

Helpful..!

[@mahmoudhalawa5588]

Thanks so much ❤️😊

[@narender6464]

Thank you so much 🥰

[@playingsometimes7290]

Nice i can understand it
Wow

[@christianmgbike6188]

When two objects or things are in thermal equilibrium, are their molecules vibrating or moving at the same speeds due to same temp?

[@raizenvillagracia7644]

Thankyou professor

[@tokahuissen6615]

it is really good

[@angeliemaebonaobra4448]

Professor Dave! Thank you!

[@rajthegamerz7118]

so long suker

[@rajthegamerz7118]

hey

[@EricPham-gr8pg]

Is pressure and intensity or decibel and compression of space elasticity

[@robertolara3820]

great man!!!! thanks!!!!

[@aksharasbhat6480]

hi professor dave ,i have one question,if temperature is nothing but kinetic energy why is it considered a base quantity

[@TheLivirus]

Explain to me the process by which temperature (the average kinetic energy of molecules/atoms) converts into thermal radiation over time.

[@asifmandal9758]

Thanks :) Professor Dave

[@mamathashaik2452]

Sir ur just awesome sir ur the best sir

[@DoubleMrE]

Yay Dave!

[@guidomista3570]

Professor Dave is the Oversimplified of science, change my mind

[@turnitinplagiarismreportch1973]

i have a question what is relationship between heat and flame if you get my point please clarify me!

[@sdvsdv4833]

Best lecture

[@princerao6525]

can u made a video on optics complete theory...plzz

[@amishakahar1282]

your video helps

[@abdullahbaloch8013]

Will you make a video on how infrared radiation increases kinetic energy of particles

[@akrm2944]

Is it better to use High/Low than More/Less kinetic energy in 4:00?

[@ProfessorDaveExplains]

eh, either way!

[@tsehayenegash8394]

what is the differnce between work done on the system and work done by the system

[@maxamuudsagaar5405]

Good idea

[@iqrayousaf6898]

My question is if any object having 37 celsius temp and our body has also d same then we will feel any cold or hot sensation or not

[@ProfessorDaveExplains]

if they are at the same temperature there should be no heat transfer.

[@nugget...]

You are just great❤

[@you2tooyou2too]

re 2:30 Not "all" but "generally"; but I'm sure he knows that there are exceptions for some crystalline solids.

[@gamingammar3838]

Thanks

[@jolynemalone]

uh thanks my school book gives a explanation on this subject but it was not very good

[@waffles_1823]

This is damn useful I even subscribed

[@user-dp3rl1dv5q]

I went from score 19 to 41 ty

[@danielyee8998]

thx

[@markbendig555]

RAISES the question, not "begs". Please. Love the videos!

[@AlexKnauth]

(2:17) "all phases of matter expand with higher temperature, whether solid, liquid, or gas"
What happens with Water when it's at the freezing point? Or just above it about to freeze? Ice is less dense than water so how does that work?

[@carultch]

That's a special condition in a substance that is a special case. Throughout the majority of water's heating from absolute zero to vapor form, it expands when adding thermal energy to the system.

[@mona5998]

hi thank about this information ..but i have a qeustion if delta T is zero how the heat(q) is not zero although they are related so the heat must also be zero ???

[@carultch]

You probably have an example of an object undergoing a phase change, where the heat transfer converts into the latent heat of the phase change, instead of an increase in the kinetic energy of the molecules.

[@sowmyatirunagari1434]

Very helpful..

[@christinetorres8075]

Yea it is

[@ThePhoenixSlayer]

Thanks Dave for all the informational vids you've been making over the years! I know you sometimes still read the comments of your old vids, and I have a question. In my science class, our teacher was talking about heat and temperature. She mentioned heat energy, but then corrected herself, calling it "warmth" energy. I'm not sure if my translation works perfectly, as I'm not learning in english, but as far as I can see it's accurate. Could you think of any reason for this change, or are these terms sort of interchangable?

[@mechanicalvibes7927]

@1:07 temperature is not the measure of heat energy available for work in a system

[@wako1285]

Who else had a teacher who made you type the URL

[@user-eh6eh1od2i]

thought i was the only one

[@korbixszn1191]

yup

[@rossfriedman6570]

I'm confused why watt over meter kelvin is used for thermal transfer

[@shahrukhkhankhan6264]

If we take two molecules of a monoatomicgas in a cylinder.why they have not contain same kinetic energy.but we know they should come be In thermal equilibrium