The First Law of Thermodynamics: Internal Energy, Heat, and Work

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In chemistry we talked about the first law of thermodynamics as being the law of conservation of energy, and that's one way of looking at it, but physicists like doing math more than chemists do, so let's talk about the first law in terms of an equation. You like equations by now, don't you? You should!
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1 авг 2024

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Комментарии : 351

@myron_jd1272 Год назад

Sometimes hearing the same information from a different person helps very much!

@sadhanajoseph2320 16 дней назад

I agree with you.

@cherylbauman9510 3 года назад

Why couldn’t you have been my professor in college? You explain everything perfectly!

@thanos5466 3 года назад

U should do study My girl 😂😂

@fishplayztoh 3 года назад

Yes

@jefrreyjeffery2192 2 года назад

You study this in college. We study this is in 10th grade in asia💀☠️☠️

@anuragchaudhary6307 2 года назад

@@jefrreyjeffery2192 We study this in college too, we do more than this, but I'm coming back to the basics, Also Asian here.

@Evangeline_Hansen Год назад

@@anuragchaudhary6307maybe you two live in two different countries/regions ,after all Asia is a big place

@user-em6nf3cn4y 4 года назад

يا رجُل ماهذا الشرح الجمييييل ، شرح مُبسط وجميل ♥️♥️♥️♥️👏🏻👏🏻👏🏻

@abdulrhman.3742 3 года назад

كملتي معه ولا ؟ عندي اختبار بكره.

@Sulfuricacid__140 3 года назад

i want all Teachers as you. You explain a lot of things in few minutes.Thank you..

@slsoefoif7678 2 года назад

Awesome visual examples and simplified to absorb the information being released, making understanding and keeping it in so much easier. Thank you, Prof. Dave!

@Rahul-hp5ie 3 года назад

I swear to study thermodynamics eagerly if he's my professor.Deserves a lot of subscribers and likes.

@TomBrooklyn 2 года назад

As always, clear, and most importantly, concise. No wasted words or time. Well done, Professor Dave

@heliumteam151 4 года назад

Me watching this 5 min shit after studying this for 13 hours straight in a complex way and dreaming about this video to be enough for my exam ....

@tommysheehan2136 2 года назад

Professor Dave helping me cram for the physics GRE, what a hero

@vaishnavipatil2972 4 года назад

Best video for understanding the concept

@derrickdanso6631 6 месяцев назад

You're making me fall for thermodynamics. Thank you so much

@MattMattMat 29 дней назад

Professor Dave is definitely still saving educational lives years later with these videos

@Vagdebrume 7 лет назад

You do an amazing job ♥ !

@bjalle3569 2 года назад

Nice video Dave, really helped me and my buddy Johan learn thermodynamics :)

@khaledzainel-dein3766 5 лет назад

Thanks for your brilliant explanation

@minimidder2025 6 лет назад

Why does this channel have so few subscribers???!! You're amaze man! Thanks! ❤

@ritikashrestha9994 10 месяцев назад

Thank you so much for sharing this 🙏...Such a clear concept.

@captainldd 5 лет назад

I loved this video. so much good information!

@muhamadabubakar7621 6 лет назад

Sir your way of explaining topic in detail is the #best.....

@muftiaaishasuhail3050 4 года назад

Thanks a lot sir! You made it easy

@EngineeringStudyMaterials 5 лет назад

Thank you for making this video. Well Explained. It Helps me a lot.

@amlansasmal 4 года назад

you are awesome sir i was unable to understand this topic...again again.... but your way is very simple and very useful to me.... keep on sir...that has a positive effect on us...😀

@maelscott7212 Год назад

Great video, one thing you missed that I think is important is if U = q - w or = q + w depending on which subject you're taking. I know that physicists and biomedical engineers use +w.

@shreya_0412 Год назад

This is my confusion too... When to use which one?

@wetworksyt4446 7 месяцев назад

@@shreya_0412if work is being done on the system, w will be will be positive and the equation will be U=q+w. If work is being done by the system, w will be negative and the equation will be U=q-w.

@aurickbiswas8233 3 месяца назад

@@shreya_0412 in chemistry work done by the system is negative and in physics work don by system is positive. Think of it like physics is oriented with profit and loss while chemistry is more about caring about the system like a baby😅

@tkub77 6 месяцев назад

Great video! This helped me a lot!

@nischalchhetri7445 Год назад

I don't know if I have gotten this all wrong, but isn't the sign convention explained here wrong? 1) Work done by the system- (-w) 2) Work done on the system (+w) This is what I have learned. Please correct me if I'm wrong. Edit- So this tutorial was for physics, not chemistry. Anyways, it's more interesting to discover that we use different sign conventions in physics.

@markvillacampa4314 2 месяца назад

I am looking for a validation of my understanding of the work done on the system because I feel like what is in the video is wrong, and I found this comment hahahaha. I searched for the work done on the system in physics and, similarly in chemistry, they are positive. So the video is indeed wrong.

@hja9157 2 года назад

Love to hear more from you

@Ali-cc3zz 3 года назад

بارك الله فيك... God bless you

@johnrayrivas1375 6 лет назад

Great explanation... Thanks

@ashensaranguhewa 5 лет назад

Thank you!

@ahmedelshazly4139 9 месяцев назад

awesome, great job professor . keep on

@miniaturenature2507 4 года назад

Amazing sir 👌 Wish you have more successful in life

@LarryWater Месяц назад

Thank you so much!

@ziadyasser8888 3 года назад

man... u r the best one explain this .........so thank u

@ramb0077 6 лет назад

thank you very much and wish you good future

@jacobthonkuotamol4927 2 года назад

I don't think there is someone like Professor Dave on the planet Earth. I am just waiting for your inventions or discoveries my Professor.

@dimpisharma9859 Год назад

Marvellous video

@crescencelee5112 3 года назад

short and easy to understand thanks

@sajukgeorge3399 5 лет назад

thankyou sir, it is very useful for me

@manishkanna532 6 лет назад

superb nd simple xplanation

@ayesha4599 3 года назад

Professor Dave is amazing, honestly!

@ayushijain8671 6 лет назад

Excellent for revision, short and crisp, covers all points quite well. Thanks a bunch. I also love your organic chemistry and dna-rna videos.

@eshaan2500 5 лет назад

Mr. Dave, you are awesome

@ViaDenglas-xz4th 3 месяца назад

THANK YOU PROF!!!!!!!!!!!!!!!!

@VishnooSpotlights 5 лет назад

We need more professors like you in India ...

@skullmax3595 2 года назад

Exactly

@Amityadav99. 6 лет назад

are in chemistry the concept of sign of W is reverse in physics

@mahiyarahman5099 3 года назад

Thanks a lot🌼 Amazing!

@guledchemist8264 7 лет назад

good explanation sir

@sadhanajoseph2320 16 дней назад

thank you sir.

@RANJANKUMAR-oj4wm 5 лет назад

Nice work

@niceguy4801 3 года назад

Thakyou professor dave!

@mohanraj-rw9du 6 лет назад

Good explanation

@jerichoytprem4527 Год назад

Wow. Thank You

@user-qj3rv2mo1b 6 месяцев назад

Exhaust stroke & also intake stroke are adiabatic processes because no heat is added or removed in the processes and internal energy reduces in exhaust stroke and internal energy is added in the suction stroke. Accordingly work is done by the system reducing the internal energy in the exhaust process and accordingly work is done on the system to shoot up the internal energy in the suction process.

@HarshaAbey 4 года назад

thank you

@leunam1leunam172 2 года назад

Very great video

@EnricoMicheli-jo6bg 3 года назад

Anyone else got exam today GL Guys also Professor Dave u a life savour

@B-MAN95 4 года назад

I'm really impressed , the way of teaching, how u remember all those things, can u give me any tips to remember easily

@ariyarathneachala6234 2 года назад

Thank you

@dimitrideville7514 Год назад

Thanks a lot!

@N3thStudios 4 года назад

Thankyou Professor

@siddhantgupta3500 3 года назад

Thanks dave

@INAYATULLAHSHEIKH 6 лет назад

Outstanding

@abdurrakib551 2 года назад

very good expression sir!

@icelerez 3 года назад

This is a great video! i just wish you wouldn't have used capital letters when referring to heat and work because they aren't state functions and should be lower case. Anyways thank you for helping a whole generation of students through college.

@user-zv1nt8lf4f 5 лет назад

so helpful

@muhamadabubakar7621 6 лет назад

Amazing sir

@user-qj3rv2mo1b 6 месяцев назад

Professor Dave: could u do YT thermodynamics videos with examples of processes from IC engine, jet engines, rockets, compressors, gas turbines, steam turbines, boilers, refrigeration cycle, heat pumps. Thermodynamics concepts would stick to comprehension and memory by using heat engines as examples. This video was fantastic and not easy to forget now because u used mechanical examples. Thank u so much

@kripashankarshukla4073 6 лет назад

You deserve to be a noble prize winner. Sir you are awesome you should get a noble prize!!!!!

@karishmakaushik9491 2 года назад

Thankyou!

@mostafaelsheikh604 5 лет назад

thanks much❤❤🌹

@stanleys2449 6 лет назад

thankyou sir...

@aicellealcala5653 5 лет назад

In checking comprehension, why the operation is addition?

@satyamsurawase4872 5 лет назад

Why the velocity increases from Sonic to super Sonic in diffuser (for steam ) ? It should decrease as the area is increasing

@fexofenadinaGenerica 7 лет назад

Awesome tutorial.

@ARJUN_Tamulpur 5 лет назад

Thanks sir

@BOLYANA 11 месяцев назад

3:49 isn’t if the work done by the system then it is negative?

@urvaali1877 2 года назад

U said constant temp. Then delta U=0,but when the state of a substance changes for eg when ice melts then temp remains constant but the internal energy changes dye to change in potential energy. How this happens?

@physics20246 3 года назад

Exordinary, congratulations, Sir

@hassaanbaiq3316 4 года назад

u do explain well include examples as u did in this video

@jrt6722 Год назад

I have a confusion question, please. In checking comprehesion question, if the system absorb heat Q = 60 J for this to occur, how could the delta U be negative, since negative delta U would be temperature going down..... how could absorbing Q cause the temperature to go down?

@devi.official23 Год назад

Tq very useful

@fatehazkhan Год назад

I have a question. In class we're taught about four processes of thermodynamics. Isobaric Isochronic Isothermal and Adiabatic. Isovolumatric and Isochronic are the same. But you didn't mention anything about the Isobaric process. And we're not taught about the Isolated system as well. Or maybe I didn't pay proper attention. Could you help me understand?

@user-ji5dl2we7t 3 года назад

thank you now i understanding therom esay.

@baslielalene4702 2 года назад

Thanks.

@Kate-em1kf 4 месяца назад

Whew this is a lot to remember

@sanikasanu5184 6 лет назад

thanks

@ilhamnaim9541 5 месяцев назад

i love your content. pliss don't die❤❤❤

@v2sisters138 6 лет назад

Amazing video! But please specify that this is from physics' point of view. according to chemistry the signs are different. This kind of induces confusion. THANK YOU!

@sychomadman 5 лет назад

thank you so much. i thought i was going crazy.

@na-chan163 5 лет назад

@Mohamed Sherif how is that so?

@fatimaisra9143 4 года назад

@@na-chan163 the surrounding energy is the atmosphere's energy and the system's energy is the internal energy

@na-chan163 4 года назад

Fatima Isra work done by system (expansion) is negative for chemistry but positive for physics. Can you pls explain this?

@fatimaisra9143 4 года назад

@@na-chan163 it's positive in phyics because we are describing the system's actions on it's surroundings, and it's negative in chemistry because the system is "throwing" out work (idk if im completely correct but im sure this is a good way to think of it)

@connorbekins8978 9 месяцев назад

is there joules of internal energy added to the kinetic energy when a hockey puck is sliding across ice? or is there no internal energy added to kinetic energy?

@Textbook000 4 года назад

Thank yous

@charleshenryescuela6452 2 года назад

the difference between changes in enthalpy and internal energy for the explosion of trinitrotoluene, TNT, at 25°C producing carbon dioxide, nitrogen dioxide gas and water vapor will be in what Joules?

@MohanySoliman 4 года назад

Good

@rachellicari5964 2 года назад

***My chemistry teacher has told me +w=work done on system, -w=work done by system

@carultch Год назад

Different disciplines will prefer different sign conventions. I'm accustomed to the heat engine sign convention, where work done by the system is positive.

@TheMultipower47 7 лет назад

I wish your channel was bigger

@ProfessorDaveExplains 7 лет назад

me too, friend!

@BjornKobeee 3 года назад

It is now

@unknown-gy8jz 3 года назад

Now it's bigger than ever!!!

@eyerus-uw7gt 3 года назад

@@ProfessorDaveExplains that's amazing and could you explain why U become zero when temeperature is constant plz ?

@John-xf7ft 2 года назад

Amazing !!!!!

@runbou3485 2 года назад

Thanks you អរគុណអ្នក

@spotify6873 2 года назад

tnx

@aneeshaperera6680 10 месяцев назад

Thanks sir.we are hoping to a vedio on minerals .

@Unknown_Ooh 3 года назад

I think I'm dropping thermodynamics

@Traewing 11 месяцев назад

😂😂😂😂😂

@cephasdn6576 8 месяцев назад

😂😂😂😂😂

@bhumikaulangwar9056 8 месяцев назад

Good one 😂

@LawsonHanson200 4 месяца назад

😂😂😂😂

@user-yw5sc4ml7k 2 месяца назад

😩😩😅😅😅😅

@baurzhanhydros9957 3 месяца назад

expansion of the gas W < 0 and compression of the gas W > 0. Because in the first case, the system does work on the surroundings so it loses work while in the second case, the surroundings does work on the system so the latter gains works which will be positive