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

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

Title	:	The First Law of Thermodynamics: Internal Energy, Heat, and Work
Lasting	:	5.44
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Views	:	465 rb

Thanks sirwe are hoping to a vedio on minerals
Comment from : Aneesha Perera

Sir you have done wrong here about sign convention work done by the system is negative and work done on the system is positive
Comment from : syeda 🥰

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?
Comment from : Fatehaz

Surely saying that the heat transferred is used to work violates the 2nd Law?
Comment from : Icehockeycreamer

I hate thermodynamics…
Comment from : Kitjai_1021

3:29 dude you're wrong bro If work is done on the system, its sign is positive If work is done by the system, its sign is negative
Comment from : daniel

Thank you science Jesus
Comment from : merl jeanno

I love ❤ the way you explain is so easy to understand 😌
Comment from : Yar Aboud

Pleas in amharic language
Comment from : Yosef Endalamaw

When work is done by the system W is negative when work is done on the system w is positive
Comment from : nourhanne nagy

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
Comment from : Manohar Approach

my prof puts links to ur videos and that means 2 things 1 he knows nothing about chemistry which he actually doesn't(don't ask) 2 u r way better than him to the point we watch YT videos in lectures instead of him doing his f job 🙂
Comment from : Abdullah Qaralleh

Marvellous video
Comment from : dimpi sharma

Procesis
Comment from : Allen Zyle Sabac

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

👏👏👏👏👏👏👏👏👏👏👏👏👏👏👏👏👏
Comment from : Philip pirrip

Wow Thank You
Comment from : jericho yt prem

I am from India ❤️
Comment from : shorts mania

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)br2) Work done on the system (+w) brThis is what I have learned brPlease correct me if I'm wrongbrbrEdit- So this tutorial was for physics, not chemistry Anyways, it's more interesting to discover that we use different sign conventions in physics
Comment from : Nischal Chhetri

Please note that you have incorrectly applied the signs for work Work is (-) when it is done by the system on the surroundings Work is (+) when it is done on the system
Comment from : K Kitzmiller

Tq very useful
Comment from : devi Official

Where do magnets fit in? Where do magnets get their energy?
Comment from : Jerry Britton

Thanks a lot!
Comment from : Dimitri Deville

Thank you
Comment from : ariyarathne achala

👍
Comment from : Shabithaa 9

Thanks
Comment from : Basliel Alene

How is the total energy of the universe constant if the universe expands
Comment from : Miyambo

What’s meant by ‘energy’ in this context?
Comment from : Daniel Lee

lecturers at most college are just novice , they should watch YouTube from professor Davebrimagine a whole lecture giving notes he copy-paste from SlideShare with zero tolerance to explanationbrCan sue such lecturers to school department because I see of no value to the university or college input and will degrade the university output ]
Comment from : Ibrahim Abdullahi Mohamed

I didn't skip the ad😎😌
Comment from : MJ

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

Just wondering if you/anyone can help with a problem? I keep getting different answers depending on the calculator I use so maybe a real engineer can figure this sum out:brbrI need to know how much energy I can extract (theoretical maximum), in kWh, when I decompress a gas from 1600 psi to 400 psi, when the volume at 1600 psi is 100 m3 and volume at 400 psi is also 100 m3 (just a big tank)brAs I compress the gas, I remove heat to a thermal accumulator, and as I decompress the gas, through a generator, I add the heat back in (atmospheric air is the gas source)brbrThanks a lot to anyone who can help I'm not an engineer and this stuff is a little above me
Comment from : Mike

As always, clear, and most importantly, concise No wasted words or time Well done, Professor Dave
Comment from : TomBrooklyn

Work done on the system its sign is positive while work done by the system its sign is negative
Comment from : changer

Thanks you អរគុណអ្នក
Comment from : Run Bou

How about when the pressure stays constant and the volume and temperature changes? brLike, a gas tube with a movable piston on it When you give heat to it, the volume and internal energy both increases dW≠0, dU≠0, dQ≠0 Does this have a special name?
Comment from : silverphoenix_17

Finishes watching video and still don’t get it* brbrI like turtles
Comment from : Airmanmx1

tnx
Comment from : Spo tify

Jax Nyx
Comment from : Jacob DONNA RHIAN TALLEY ANPUT WHIS Smith

Amazing !!!!!
Comment from : 1 John 4:19

Love to hear more from you
Comment from : H J A

Please provide more comprehensive questions related to topic
Comment from : Turkish fan Girl

Thank u sir you cleared my confusion as fastest as I could not imagine I am engineering student and I love chemistry but after sometime I forget the real concept
Comment from : Turkish fan Girl

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
Comment from : Jacob Thon Kuot Amol

why was (150J) taken positive ??? In the Last Example?
Comment from : Shah Xad

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

Thankyou!
Comment from : Karishma Kaushik

what is the difference between heat transfer and temperature being constant, aren't those the same thing, if temp is constant we won't have heat getting transferred right?
Comment from : Chaimae El assaoui

I think there are mistake in work subject
Comment from : احمد صالح

Awesome visual examples and simplified to absorb the information being released, making understanding and keeping it in so much easier Thank you, Prof Dave!
Comment from : SLS OEF&OIF

IUPAC said that work done by the system is negative and vice versa
Comment from : YaakovGamer_0001

Thks sr you're legend 😎⚡
Comment from : shadow X

Very great video
Comment from : Leunam1 Leunam1

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?
Comment from : Charles Henry Escuela

👏👏👏👏👏👏❤️❤️❤️❤️❤️❤️
Comment from : Alaa

very good expression sir!
Comment from : Md Rakib Hasan

At 3:46, aren't the signs for W incorrect? Shouldn't work done by the system be -W and work done on the system from surroundings be +W? Am I misunderstanding something?
Comment from : Amino Beano

Professor Dave helping me cram for the physics GRE, what a hero
Comment from : Tommy Sheehan

Thank You Jesus✌🏻
Comment from : mike g

how about isobaric
Comment from : Nokito Sembrano

Coool
Comment from : Ulan Rakhmanov

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
Comment from : Gicel Perez

I really wish I had a physics tutor like this Unlucky me
Comment from : Shihan Rahmi

mashaa Allah thanks professor
Comment from : Apdullah elaarg

thank you now i understanding therom esay
Comment from : ايات محمد عبد علي جبار c3

man u r the best one explain this so thank u
Comment from : ziad yasser

Thakyou professor dave!
Comment from : Nice guy

I got the comprehension right! :D
Comment from : Bunlong Tan

I thought when you did work ON the system that it gained energy and when the system DID work, it lost energy?
Comment from : Anthony

Thanks a lot🌼 Amazing!
Comment from : Mahiya Rahman

Work done by the system should be negative as the system is losing energy by doing work, right? In the video, it's being said the opposite way!
Comment from : Sree Nivetha B B

short and easy to understand thanks
Comment from : Crescence Lee

i want all Teachers as you You explain a lot of things in few minutesThank you
Comment from : Artistic Imagination

Question: Why must heat be represented by "Q" and internal energy is to be represented by "Delta U"?
Comment from : Ice 487

Can anyone help me please ? Answer me please🙏🙏brWhat's the difference between First law and second law ?? brThe second law also says all the heat given is not used up for workbrbr2nd law says some energy is lost as heat whIle doing the work and thus the efficiency of engine cannot be 1brbrSo is the HEAT THAT IS LOST IN RAISING THE INTERNAL ENERGY,(According to 1st law) SAME AS THE HEAT LOST DUE TO INEFFICIENCY?? (According to 2nd law)?? brbrSomeone help please 😭🙏
Comment from : Physics