Is ENTROPY Really a "Measure of Disorder"? Physics of Entropy EXPLAINED and MADE EASY

[@ParthGChannel]

Hi friends! I've just made a video showing you how to count the microstates in a system - this is the most fun part of calculating a system's entropy. Check it out here: kzbin.info/www/bejne/aaHPkKOAhqmKas0 As always, thanks so much for your support! :)

[@edyt4125]

Awesome videos and follow ups! Great work, keep it coming!

[@mohitjoc25]

You are amazing teacher.....

[@shrujana4114]

💙💙💙

[@saraw8104]

Can u have more than one definition unless you prove that they are equivalent?

[@jceepf]

@@saraw8104 Yes if you can at least verify it experimentally. It is not easy to tie the statistical definition to the thermodynamic one..... but a lot of semi-rigorous arguments are possible. (Entropy thermodynamically in the integral of a heat transfer over the temperature as pointed out in the video. Weird! The Greek Ottoman Empire mathematician Caratheodory had a very mathematical justification of this entropy.)

[@SteveMould]

Lovely stuff!

[@cpgrace1902]

Legend

[@maheshwarannarayanan]

Legend Steve mould's comment

[@TheHumanHades]

I love your videos

[@blabby102]

I loved your video on entropy! I had a mathematical understanding of entropy but your video gave me a more intuitive understanding.

[@kAY-yl5en]

Watched youe vid on it too....

[@antonk.653]

Hello, I'm a physicist (PhD student) myself, and I'm positively surprised to having discovered this small channel. I like the quality and dedication you put into your videos in order to explain physics in an understandable manner. Everything was very neatly explained and illustrated, I'm delighted to see you explaining the energy scale subject AND clarifying that it is not about actual height levels of a box, because I very often see non-scientists confuse those. Thank you for that. Now for some criticism: Of course, everything makes perfect sense for me as a physicist, but I would like to see more explanation about why you set up those seemingly arbitrary rules. For example, a normal person might not know why the energy of a system is such an important parameter and why you're constructing your box in such a way that it remains constant. Also explaining what an "isolated" or "thermal equillibrium" system means in this context might help alot. Finally, I kind of missed the conclusion for the macroscopic world about this definition of entropy, for example what a system with many possible microstates actually means. Also, it is a missed opportunity in my opinion to not touch the subject about microstate transitions because this is fundamentally the reason for disorder, because the system tends to spread out into a variety of microstates AND that it is in general impossible to measure all those at once - hence the disorder i.e. lack of information. But all in all, very well made video, 9/10. You've earned my subscription, and I'm eager to see more good content!

[@nodistractions3633]

I love the fact that you actually explained macroscopic entropy while rolling down the criticism. Appreciate your knowledge and expertise.

[@cooganbeggs4942]

thanks for the further explanation. Sounds like you need to make a video on the topic for us neophytes? 🤔

[@policyfirst4399]

He did state that he was just trying to build an intuition for entropy in this video.

[@shawongupta353]

@anton k hello sir may i have your facebook account? I had some questions on physics and cosmology

[@stevekru6518]

The video serves its purpose perfectly and - much like Emma Peel (google if you’re too young to recognize the name) - fully deserves a 10. Your suggested improvements would triple the length, losing viewers for minor gain. I’d like to think my opinion is not biased by the Halo Effect of Parth’s compelling personality, but he could make good channel describing grass growing or paint drying.

[@harshbhogal4439]

when he said " we have a box." idk why my brain said "we put a cat in it"

[@rogerkearns8094]

Rather, we killed a cat in it - or did we?

[@shubhankartiwari5101]

Good one 😂😂

[@rajaradi802]

Because you are a quantum mechanics enthusiast

[@arnabbanik6403]

I was like, now let's derive the wave equation of a particle in that box.

[@TheDavidlloydjones]

😂🤣 🤦‍♂️

[@pulsar22]

Your explanation implies that the universe is actually moving to a lower entropy as it cools down. I actually agree with this!

[@ShubhamSharma-rt4si]

I'm dealing with this term since 5 years of my study and nobody explain me like this. As always love to learn from you sir. Thankyou

[@harshbhogal4439]

Parth: hottest day reaching 35 degrees me who has gone through the 50 degrees heat in Delhi: u gotta pump those numbers up those are rookie numbers. 😂😂 LOVED THE VIDEO AS ALWAYS. THANKS FOR CONSTANTLY INCREASING MY LOVE FOR PHYSICS.

[@kartik.chauhan]

**Those are rookie numbers**

[@LaMirah]

Yeah, 35°C is great, you're still warmer than the environment. When the cooling breeze becomes a warming breeze and the only way to cool down is by sweating (and praying for low relative humidity) is when you can start bragging about the heat.

[@ParthGChannel]

Haha our houses in the UK are built for the cold, not for the heat!

[@palash4601]

@Neko Kotori coz they gotta bring together the nationalists. And wherever there's nationalists there is no reason or logic. Simple

[@philipberthiaume2314]

I am in Canada where we can go to -25°C on a regular basis and then we can swing up to 35° in July/August. I have been told by some of our India born citizens whom I work with, that anything over 32-34 in Canada, because of humidity, is more uncomfortable than many summer days in India.

[@Zehkari]

As a 3rd year physics student, these documents are brilliant. We learnt some T&Statistical physics last semester but you have done a brilliant job explaining Boltzmann's entropy equation. If you keep the same format of the LaTeX document for each subject you eventually work on, this could build up a wonderful resource of learning. I would support a patreon if you started one. With every video so far I have watched from your channel, you explain the topic very clear.

[@sozo8537]

I recently discovered you and I cannot believe you only have 78k subs considering the quality of of your videos and the work you put into them.

[@suemiller9506]

Just found this - it is so helpful. The 'measure of disorder' definition seemed so vague until you explained what it means. Accessible video that give real insights.

[@AleKaledin]

Man you are a genius. You explain so difficult thing in so easy way. It's become so clear for me. Thank you! I’d love to listen more about classical definition of entropy and how it corresponds with Boltzmann entropy.

[@reneecampbell3757]

Before watching this video, I watched what I assumed would be an easier watch with a TedTalk and by far your video was much much better. Thank you and good job!

[@tolitsdterrible4785]

Deym! This is the clearest explanation I've ever seen on entropy. Thanks a lot.

[@cosmovate4081]

Man I wish my physics textbooks were like your document. Didn't really have a lot of problem solving them after your explanation, don't know if our physics textbooks are at fault or our teachers at school.

[@ParthGChannel]

Thank you so much! Glad the questions were useful :)

[@munaokeke6216]

How bout both

[@meowwwww6350]

@@munaokeke6216 LoL 😂

[@aryansharma-fg3gl]

Knows it will be a amazing video without watching it completely.

[@ParthGChannel]

Thanks Aryan :)

[@davidtang2549]

As a physics undergat, I would say this is the best way for everyone to learn these concepts. I really should have watched this in high school...

[@AstronomywithManas]

Entropy was a concept which no one could explain me for a long time in such simple terms, Your Every video has Helped me increase my Interest and Knowledge in Physics in a Fun Way!!!!! Waiting for more Videos on Quantum Mechanics as well!!

[@art3miy]

This is the best explanation I have ever encountered on youtube. Thanks, mate.

[@aaditya3766]

IM IN 3RD YEAR OF BTECH IN MECHANICAL ENG. TILL TODAY I NEVER UNDERSTOOD WHAT EXACTLY ENTROPY IS . BUT WITH YOUR VIDEO I UNDERSTOOD SOUL OF ENTROPY . THANK U SO MUCH

[@franadillongalvez3330]

Wow... You're turning out to be my favourite youtube channel... I really enjoyed the video, and also the document you made. I hope you will keep the upcoming videos and documents for free (at least the solutions, as you mentioned in the conclusions), cause otherwise i won't be able to access those. However, i understand you want your work to be molt valuable. Anyway, do whatever you think it's best and keep doing these fantastic videos ;)

[@turkirob]

You are reallt genius for the first time I able to understand entropy

[@lysiri12]

The whole purpose of your channel is beautiful, gave me a lot of different ways to approach topics that I find hard to grasp. Thank you! ❤️

[@ParthGChannel]

Thank you so much!

[@GMIKE2010]

Probably the best explanation on Entropy I’ve heard so far!!

[@anjalibhattacharyya4940]

Amazing video sir. Although entropy is prescribed in Our 11th standard chemistry syllabus but your explanation gave me a overview before starting the chapter. Thank you and kindly consider making a video on special theory of relativity.

[@jainilpatel2160]

great explanation man finally after scrolling through 10 videos understood entropy properly

[@gsant3204]

Awsome, this is the first time someone explained Entropy this way!

[@nofy7819]

This video got recommended to me and even though i'm in no mood study right now the thumbnail made me chuckle a little bit.

[@boogychan]

He is the modern Feynman that everyone loves

[@daydays12]

the very best explanation of entropy I have come across. thanks

[@박로이-z8x]

Parth!!!!! Amazing video! Heading straight to the worksheet. Thank you~^^ Edit: Okay so here I am to share my thoughts. I thoroughly enjoyed the 8 pages. The questions were quick to solve after watching the video. I was stuck on the equation question but then your solution was handy so was able to get around it easily. Once again thank you so much~ And yes "indistinguishability" is indeed a long word. Lol!

[@ParthGChannel]

Hey thanks for checking it out, and for your feedback :)

[@lakshthaker6379]

Superb video Please make a video on Copenhagen interpretation

[@naomyshane3150]

OMG you're so good. Feeling lucky that this video popped up in my home page and I found this channel. Keep up the good work and TYSM for these brilliant contents.

[@arulbalasubramanian9474]

Have never seen such a nice explanation of Entropy.

[@shravantyagi625]

For the first time I actually understood entropy. Thank you so much ❤️

[@dossube]

My friend, you have made one of the best concept explanation videos on KZbin. It's actually more fun than most weeknight shows on TV. Now, I'm going to subscribe for more. Thank you!

[@iankr]

'Fun physics content' - not a concept when I decided not pursue physics beyond O-Level in 1976. Many thanks, Mr G. Have subscribed in the hope of being better educated.

[@haneenzaqout2956]

I am self studying thermodynamics and I would love more of your videos about topics related to thermodynamics !!

[@georgepp98]

Thats rlly amazing. Unbelivable this golden information is freely available.

[@mikebellamy]

As soon as anyone says _"entropy is a difficult subject to get your head around"_ I get very suspicious about the motive for doing this because *its not* if you just tell the *truth!* Much as I enjoy your clear presentation Parth, I need say what is missing here, which is actually the reason why entropy is difficult to understand now, because it didn't used to be. 1) The *microstates* of a system are not only the arrangement of energy levels, they also include all possible *positions* of the particles! 2) Omega is *not* only the total number of microstates in the system it is usually less depending on the choice of *macrostate!* 3) The assumption Omega = total number of microstates is required to derive Clausius equation for entropy change, as is the inclusion of the Boltzmann constant and the use of the natural logarithm. 4) Richard Feynman would teach Boltzmann's equation setting k = 1 and use log (base 10) so he had s = log (Omega) and that is still a valid entropy. But this means entropy actually has *no units* its just a number ! Which is the truth. What all this means is you have been taught entropy from a *naturalistic* point of view which omits certain facts which end up making entropy confused. You really need to question things more. The original Boltzmann equation was easy to interpret as *measure of disorder* because order is *intuitive* because the assumption *all microstates are equally likely* actually dictates the process is *random* and random processes *always create more disorder* which is the normal perception. *BUT* doing that makes, as James Jeans put it *entropy is purely subjective* because the *macrostate is a choice of the observer* and that makes entropy *subjective.* In fact just like the term probability, entropy does not exist outside of a *mind* it is *not of nature!* and that is a big problem for naturalists who can't accept anything which is not of nature and minds certainly are not. Sorry but this must be said.

[@globaldigitaldirectsubsidi4493]

such a kind idea to make tests for your viewers, so they can actually train their memory and understanding! Thank you!

[@anant_singh]

I was badly waiting for the video, but at last it came out 😊 And ............. it was awesome as always . and I have shared it to all my friends 😁😁😁

[@bibhuprasadmahananda6986]

Keep giving such questions at the end of every video bhaiya.... I am confident that I know at least something about entropy..... ❤️

[@radhanmoodley5594]

I love your teaching style. Congratulations. Radhakrishnan

[@linajadid9621]

I'm an 8th grader and this video was actually really helpful and easy to understand. Thank you !! You got a new sub :3

[@MMNayem-dq4kd]

Really loved the document put in the description box discussing 5 interesting questions regarding entropy. Hope to have this kinda document as a supplement of your great video in future. You rock brother ♥

[@TLinnNguyen]

Finally, I understand what Entropy is.

[@arnabbanik6403]

Your videos are just amazing, they make these shady concepts so clear to me. Thanks a lot. You know it would tremendously help if you would make playlists of videos, going through the different topics: like a playlist for Quantum Physics, one for EM waves, one for Mechanics using Hamiltonian and Lagrangian, etc etc.

[@shyamdwaram4459]

Awesome presentation bro 👌. I hope every student gets a teacher like you !!!

[@tom-lukaslubbeke949]

I really liked the video, but I loved the document even more, as it helped wrapping my head around the concept once again. I really like your content, keep up the good work

[@mateuskosicov9817]

My new favorite youtube channel, thanks a lot for the great content!

[@rsurong662]

Beautifully explained! Thanks!

[@saiteja2656]

i really like yor way of explanation sir i hope you will make a playlist on EMFT, quantum physics etc... you are the best in this field although i am an engineering student i watch your videos because your way of explanation and presenting the content is different and very interesting. definitely you are one of the best youtube educator

[@SoumyaSarkarRobinhood]

Thanks for the document.. It helped me brush up the basics of Stat Mech. ❤️

[@Papa_and_son2024]

Sounds like Emmy Noether had something to say about entrophy in abstract algebra. Your examples reminds me about symmetries in abstract algebra. But then again symmetry is orderly. 6 probabilities of turning a triangle while it still remains symmetric. Vs 6 ways of arranging your Particles in a 5E box.

[@johnpaulbounce3708]

That was great. Never had that kind of explanation before. Entropy is much cooler now than before. Though physics is really cool. Thanks.

[@ComplexCorsair]

Hey Parth, I don't know if you'll ever read this, but thanks a lot. I'm your average 11th grader from India, hope this doesn't send anyone away. When I was in 9th, these fundamental concepts of, well, "advanced science" (for me it was that at that time). Entropy, superposition, uncertainty principle, Schrödinger's cat, entanglement - extremely overwhelming, but still had fun scrolling and watching videos about them. Soon I got burnt out because of how difficult that felt. I did know the usual narrowed-down definition of entropy at that time, but watching videos about it actually kind of got me confused. As if calling it a measure of disorder is a crime lol. But after watching your video and going through that PDF (it's awesome btw, thanks again), maybe it's not that bad of a definition. It actually sounds quite satisfying, looking at the equation. Maybe I'm still confused, someone help me lmao. Of the PDF, I skipped the last question, because I'm lazy, I apologise. Got a few right. Everything suddenly feels crystal clear. Man, I'm so happy right now, hope I got the idea about entropy right this time. You're the man, keep the good work up brother!

[@rubyruby9272]

wow, that's so amazing. You explained so nicely that anyone can understand physics. Thank you :)

[@hassanjacobs7506]

Man I love your channel. Physics sound so interesting when you speak about it!

[@rio_agustian_]

YES! I love the document you made with some questions in it. It really helpful 👌👌👌

[@sohamadak6811]

That was very well explained, coincidentally the formula S=Kb.lnP was told to us by our chem teacher during Solid State. It makes sense now

[@anjana8002]

You know what, you're a life saver! I just understand everything better.

[@kripayadav764]

Thankyou so much for this video sir.......I am currently in class 11th and wondering about what actually entropy is....but this video satisfied me and now I can feel this topic.....

[@SKARTHIKSELVAN]

Thanks for putting lot of efforts in making these videos. I like your questions in the document.

[@ta4h1r2]

Really liked the questions document. It's an effective way of internalizing the video content. Would love to see more of them. (:

[@tomdukowski]

Thank you for this. It provides a lot of clarity.

[@virginiacantoneptoe5092]

I enjoyed your description of the basics of Entropy.

[@NicolaiNita]

I love the way you explain it, simple and clear! Thank you.

[@ilkhombekkholiyarov3088]

Brilliant, you explained it better than my university professors

[@jyke321]

This makes a lot more sense now than 3 years ago when I was sitting in chem class sophomore year. I wish I took that class a bit more seriously.

[@paulquirk3783]

I wasn't too excited by the title of this video until I noticed you would cover what entropy is "like...actually." So few people do the extra work to cover that approach to a subject! 😂😂

[@blurp8996]

hey just wanna say i thoroughly enjoy ur physics vids! you're a really great teacher

[@roger72715]

I've waiting for this one for a long time now.

[@flynig1]

Top 5 explanation on yt

[@adityasinghds7204]

Hey Parth, the questions in the assignment is pretty good ...it helps us to clear our concept ......so in the upcoming videos you can give us this assignments....it helps us a lot....😊

[@gibbogle]

Very nice! Reducing to such a simple system makes understanding simple. The next step would be to explain how entropy never decreases in a closed system.

[@ayme3496]

Wow 🥺 Too good to be true .. And yes.... I'm using your document to study 👍👍

[@BabbageIsBack]

Thank you! This was really clear and easy to understand 🤗

[@JayC0325]

I think of entropy as a compensation that system pays in terms of energy lost or gained due to disorder or randomness of particles. In another equation, change in entropy is related to change in enthalpy (energy of system) at a certain temperature.

[@juliettelacherez]

Starting my master's degree next autumn, thank you for helping me :)

[@edzielinski]

A well done and lucid explanation.

[@mikecrockett3669]

Really well done. Thanks for sharing.

[@raestanton-smithson3258]

Really great explanation, thanks so much. Definitely going to check out your other content. Very well explained and perfect language for laypeople 👌

[@rushivaghela1552]

Honestly speaking, a very helpful video

[@Pattnaik11]

Love you boy,I expected this kinda explanation from my teacher,but nvm,got you

[@xouzaing7868]

The document was awesome in helping to solidify what I learnt in the video 😊. It was good with the questions.

[@Afthab_s]

Well explained brother Super helpful content🔥

[@HinduHeads]

Life changing video. Sincerely.

[@varun9346]

I explained this to my classmates and they told me that you are next Einstein. I just laughed

[@phychemt]

This video could not explain the need to study entropy. I remained alienated from the topic throughout the video!

[@mondherbenromdhane2069]

great explanation for the microstates ! but I would have loved that it translates into some examples like why hot water has higher entropy than cold water etc ...

[@fabienpaillusson7390]

Simple and pedagogical description of statistical entropy 👍

[@RobertRingIII]

Well done.Very lucid presentation. Please elaborate in some future video how entropy is related to energy unavailable to do useful work.

[@flyingisawol]

man that was so good! KZbin university strikes again!! Thankyou sir

[@stephensheppard]

This was a very clear, very nice discussion. It would be interesting (but perhaps outside the theme of your channel) to discuss the "non-equal probablility" (non-equilibrium) version of entropy and then link it to Shannon entropy and information.

[@arvind2414]

Amazing content man 🔥

[@PriyanshuSharma-ri3ls]

Please tell us about cells and compartments i love the imagination and examples you give

[@nicolastelfyr6792]

Great video, I've enjoyed watching it.

[@shekharbhaskar3431]

Beautifully explained 👏

[@querrythis]

Great explanation. Thanks for the clarification.

[@Uri1000x1]

The Kinetic Energy of a gas particle is K.E. = 1/2(mv²), so the energy of a gas particle in box depends on its speed. By chance collisions, individual gas particles may occasionally be bumped to unusually high energy. Parth uses a box with particles that may only have discrete energy levels and indicates that this is a quantum dynamics statistical treatment rather than a thermodynamic statistical treatment.