I wish I was taught Entropy this way!

00:00 Why thinking of entropy as disorder causes problems
01:25 The most fundamental question in all of physics
03:25 A key non-intuitive statistical result
07:14 A tool to help think critically
08:54 Why doesn't a gas compress spontaneously?
13:01 Macrostates, Microstates, Entropy, & Second law of thermodynamics
15:44 Why doesn't coffee and milk spontaneously unmix?
16:47 Why entropy is the arrow of time
17:44 Shouldn't THIS break the second law of thermodynamics?
19:55 Shouldn't Maxwell's demon break the second law of thermodynamics?
23:00 Why is entropy a measure of energy concentration?
25:41 Shouldn't refrigerators break the second law of thermodynamics?
28:00 Shouldn't life break the second law of thermodynamics?
30:40 Fermi's paradox

This video was sponsored by ground news

[rodrigoborges]

"when you learn something new, try to critique it, try to break it, and see what your logical flaw is, because that's how you deepen your understanding" is one of the most powerful phrases i've ever heard out of an educator. Beautifully said, Mahesh!

[geeblenhoff]

I have a bachelors in physics and I didn’t realize just how surface level my understanding of entropy was till I watched this video. You have a beautiful way of explaining physics

[gauripriyakandakatla]

This is one of the best science communication channels out there. The science is rigorous and grounded, and it’s explained in an intuitive way without confusing the audience with fancy jargon. Every time I watch a video, I come away with a deeper understanding, and the sheer passion with which he talks about these concepts is contagious. Please don’t ever stop making videos!!!

[davidmcc]

I have a degree and PhD in chemistry and your explanation of entropy is the best I have come across. Bravo! 👍

[Devasia.Thomas]

You, Sir, just increased the entropy of my brain like crazy and that of everyone, collectively, exponentially.

[tiberiusgracchus]

Damn dude. I have struggled for so long with trying to have a more intuitive understanding of what is really being described by the term entropy. I have read books and watched countless videos on it. I have sat around thinking about it for hours. And here you made it so simple and so intuitive and did it in such a short amount of time. I could literally feel the lightbulb go off in my head. It's like a burden has been lifted...lol. You have a real gift. Thank you!

[RandomToon]

I thought I understood things. Watching your videos has helped me understand that I did, but not at the level that I thought I did. This has really helped me have some "ah, that is the part that I was missing!" moments, and I adore that. Great stuff, and I love your energy. I wish you much success.

[rosslewchuk]

First time in 50 years I have ever encountered the micro states concept. Very helpful indeed! Thanks for presenting Feynman's approach!🎯😊👍

[Soham_]

Oh boy please never stop posting these informational videos that often our teachers just let go under the rug. They just want us to memorize and here you are, the Messiah, reviving my curiosity 😂. Thank you very much. I just came across this entropy thing in thermodynamics and well I can solve questions but I understand nothing about it. I am very confident now I will know after seeing your video. Thanks again

[michaelpetzold]

Your enthusiasm is contagious. I have been grappling with the concept of entropy for quite a few years. This really helped!

[aminelahlou]

In order to use arrangements probabilities, the positions must be independent from each other. But this not the case here 12:55 because atoms collide with each other so they are not interindependant. So the probability is not 0.02% (0.18/850) but actually lower because collisions maximizes the distance between atoms. (Hence low temperature creates solids)

[jewiesnew]

I head read many physics books throughout my life and I'm surprised I'm still learning something new from you! You are a great science communicator, and please, never stop making these!

[Steaphany]

This explains why I'm compelled to watch more physics videos, the more information in my head means higher entropy

[research-cc]

PLEASE PLEASE PLEASE NEVER STOP MAKING THESE VIDEOS...I AM IN INDIA AND AM CURRENTLY IN THE TENTH STANDARD AND LOVE WATCHING YOUR VIDEOS BECAUSE I HAVE A CURIOSITY FOR SCIENCE AND PHYSICS SPECIFICALLY...YOU ARE ONE OF THE FIRST PEOPLE WHO HAVE MADE SUCH COMPLEX CONCEPTS EASILY UNDESRTANDABLE..THANK YOU FOR ALL YOU DO❤❤❤❤

[roberttikens]

As an electrophysiologist interested in biophysics, I've always found the diffusion phenomenon fascinating. I love how Schrödinger put it in his book "What is life" :
"Imagine a vessel filled with a fluid, say water, with a small amount of some coloured substance dissolved in it, say potassium permanganate, not in uniform concentration, but rather as in Fig. 4, where the dots indicate the molecules of the dissolved substance (permanganate) and the concentration diminishes from left to right. If you leave this system alone a very slow process of 'diffusion' sets in, the permanganate spreading in the direction from left to right, that is, from the places of higher concentration towards the places of lower concentration, until it is equally distributed through the water.
The remarkable thing about this rather simple and apparently not particularly interesting process is that it is in no way due, as one might think, to any tendency or force driving the permanganate molecules away from the crowded region to the less crowded one, like the population of a country spreading to those parts where there is more elbow-room. Nothing of the sort happens with our permanganate molecules. Everyone of them behaves quite independently of all the others, which it
very seldom meets. Everyone of them, whether in a crowded region or in an empty one, suffers the same fate of being
continually knocked about by the impacts of the water molecules and thereby gradually moving on in an unpredictable direction - sometimes towards the higher, sometimes towards the lower, concentrations, sometimes obliquely. The kind of motion it performs has often been compared with that of a blindfolded person on a large surface imbued with a certain desire of 'walking', but without any preference for any particular direction, and so changing his line continuously. That this random walk of the permanganate molecules, the same for all of them, should yet produce a regular flow towards the smaller concentration and ultimately make for uniformity of distribution, is at first sight perplexing - but only at first sight. If you contemplate in Fig. 4 thin slices of approximately constant concentration, the permanganate molecules which in a given moment are contained in a
particular slice will, by their random walk, it is true, be carried with equal probability to the right or to the left. But precisely in consequence of this, a plane separating two neighbouring slices will be crossed by more molecules coming from the left than in the opposite direction, simply because to the left there are more molecules engaged in random walk than there are to the right. And as long as that is so the balance will show up as a regular flow from left to right, until a uniform distribution is reached."
Just beautiful.
Thanks for all of your work Mahesh!

[JamesD]

You're the best physics channel. I love your enthusiasm. Reminds me why I got into physics to begin with. Thank you

[সাইন্সভিডিও_শর্ট]

Bro, explain pauli exclusion principle next... Why bosons are symmetric and stay together and why electrons are asymmetric and can't occupy same quantum state.

[bsatyam]

Your enthusiasm is infectious! I wish I had teachers like you when I was a physics grad student in Göttingen. I dropped out due to falling behind and depression. I've moved on to a career in CS, but I still love physics.

[crazymathematician]

Imagine struggling with entropy, someone find your video. Highly relieved.❤

[damsarotti]

Dios mío, I've just subscribed. I studied chemical engineering 'til 5th year, and these questions and topics have always been on my mind. Entropy has always been a topic that fascinated me deeply, but I always thought I didn't quite get it. I quit studying this career because I learned about myself that I did not care about applying this stuff to industrial growth, and I'd rather think and philosophize about it, but that's a different story. Your videos made me want to get back to this. Get back to science, to question everything. Thank you for that. Greetings from Argentina.