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

@sadhanajoseph2320

23 күн бұрын

I agree with you.

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

@thanos5466

3 жыл бұрын

U should do study My girl 😂😂

@fishplayztoh

3 жыл бұрын

Yes

@jefrreyjeffery2192

2 жыл бұрын

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

@anuragchaudhary6307

2 жыл бұрын

@@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

Жыл бұрын

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

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 ....

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

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

@abdulrhman.3742

3 жыл бұрын

كملتي معه ولا ؟ عندي اختبار بكره.

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

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 ай бұрын

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.

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

Best video for understanding the concept

You do an amazing job ♥ !

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

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

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

Жыл бұрын

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

@wetworksyt4446

7 ай бұрын

​@@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

4 ай бұрын

​@@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😅

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

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

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

Thanks for your brilliant explanation

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

We need more professors like you in India ...

@skullmax3595

2 жыл бұрын

Exactly

I loved this video. so much good information!

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...😀

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

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.

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

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

Thanks a lot sir! You made it easy

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

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.

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

Great video! This helped me a lot!

thankyou sir, it is very useful for me

Amazing sir 👌 Wish you have more successful in life

I think I'm dropping thermodynamics

@Traewing

Жыл бұрын

😂😂😂😂😂

@cephasdn6576

8 ай бұрын

😂😂😂😂😂

@bhumikaulangwar9056

8 ай бұрын

Good one 😂

@LawsonHanson200

5 ай бұрын

😂😂😂😂

@user-yw5sc4ml7k

2 ай бұрын

😩😩😅😅😅😅

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

Great explanation... Thanks

Marvellous video

Thank you!

awesome, great job professor . keep on

thank you very much and wish you good future

بارك الله فيك... God bless you

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 жыл бұрын

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

@na-chan163

5 жыл бұрын

@Mohamed Sherif how is that so?

@fatimaisra9143

4 жыл бұрын

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

@na-chan163

4 жыл бұрын

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

@fatimaisra9143

4 жыл бұрын

@@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)

Thank you so much!

superb nd simple xplanation

thank you

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.

Thankyou Professor

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

short and easy to understand thanks

Love to hear more from you

In checking comprehension, why the operation is addition?

I wish your channel was bigger

@ProfessorDaveExplains

7 жыл бұрын

me too, friend!

@BjornKobeee

3 жыл бұрын

It is now

@unknown-gy8jz

3 жыл бұрын

Now it's bigger than ever!!!

@eyerus-uw7gt

3 жыл бұрын

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

good explanation sir

Good

Mr. Dave, you are awesome

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

Thank you

Good explanation

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

Nice work

thank you sir.

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

Hey quick question for those interested. How much do you need to cool a solar cell operating at, let's say, 23% efficiency? My thoughts are that a solar cell should not change its internal energt U, so in other words deltaU or dU/dt should be 0. So 23% of the solar energy becomes electrical work, while the rest of the sun's power (1-0.23=0.77) is transferred as heat that, without cooling, would accumulate in the solar cell. In order for dU/dt (delta U) of the solar cell to be 0 you need to fulfill Q=W, so in other words you need to cool the cell to such an extent that the only heat that isn't cooled off equals the electrical power of the solar cell, in this case 0.54 times the power of the sun? Is this way of thinking correct? I would very much appreciate any input.

@carultch

Жыл бұрын

Yes, indeed, that is correct. This is why the panels heat up, if you turn off the system and make them remain at open circuit. The lack of a destination for the power to go, means that they heat up to a temperature where they can radiate more energy to the background. This is counterintuitive, because most of the time, operating electrical equipment makes it heat up, rather than cool down.

Professor Dave is amazing, honestly!

Wow. Thank You

Thanks a lot🌼 Amazing!

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

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

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?

Thakyou professor dave!

Very great video

Exordinary, congratulations, Sir

Thanks for the video, but am confusing a bit . If work done by the system that mean system loss energy to surroundings which decreases the internal energy of the system , so it should be negative. Please need more explanation

@evelyntromp789

Жыл бұрын

I’m obviously not Prof Dave but I think it’s positive because the equation has a negative W, whereas most equations have a positive work (dU = Q + W)

Thanks dave

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?

Thanks a lot!

thanks

so helpful

I think there are mistake in work subject

Thanks.

very good expression sir!

Why Q - W and not Q + W, but change the sign convention of work done to match that of Q?

expansion 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

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

@carultch

Жыл бұрын

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

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

why was (150J) taken positive ??? In the Last Example.?

Is bomb calorimeter similar to Explosometer that explodes a mixture inside a portable sealed box to detect possible hydrocarbon leaks in petrochemical plants. It’s replaced with sensors for detection. Thanks Isovolumetric process because heat transferred from the spark to just change the internal energy inside the box and the increase in temperature or no temperature increase is visible on the meter to the user.

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?

Amazing sir

Sir in an isothermal process how the temperature is maintained constant if we add heat?

@ProfessorDaveExplains

6 жыл бұрын

usually very slow heat exchange

thank you now i understanding therom esay.

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

Outstanding

thankyou sir...

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?

Tq very useful

Thanks sir

please make a video on carnot engine or carnot cycle

@ProfessorDaveExplains

5 жыл бұрын

that would be the second law, the one right after this!

Hello sir.Can you I suggest more lesson sir?

sir does work done on the system indicated negative sign? please tell me.

@llll-lk2mm

3 жыл бұрын

Depends on what subject. In chemistry work done on system is +ve and by the system is -ve. In physics, work done on system is -ve and by the system is +ve.

Thankyou!