A better description of entropy

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Steve Mould

Steve Mould

Күн бұрын

I use this stirling engine to explain entropy. Entropy is normally described as a measure of disorder but I don't think that's helpful. Here's a better description.
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Пікірлер: 4 348
Gordon X. Frohman
Gordon X. Frohman 6 жыл бұрын
The reason that train isn't moving is because the driver wants to postpone the heat death of the universe by not increasing entropy.
Steve Mould
Steve Mould 6 жыл бұрын
+Gordon X. Frohman :)
Rakhi Goyal
Rakhi Goyal 5 жыл бұрын
Gordon X. Frohman Hahaha!!!😀
Brendan 4 жыл бұрын
aud_io a great way of extending the life of the universe, but alas still does not prevent the inevitable end
Pathrender 4 жыл бұрын
aud_io to turn off the fusion reaction youd have to figure out a way to negate gravity, it's the gravitational pull of an star that makes the core dense enough to fuse, so in order to stop fusion youd have to cancel out all of the pressure caused by gravity
Larry Thielen
Larry Thielen 4 жыл бұрын
aud_io But you would increase entropy by trying to stop the fusion in stars. The energy it would take to do that, would probably be more than if we just let it happen.
Phillip Arab
Phillip Arab Жыл бұрын
This really bridged the gap for me between the statistical “ping pong ball” analogies ive heard, and the teachings of physically irreversible processes when describing entropy. Great video!
jenibluere Ай бұрын
First watched this video when I was in high school, found it absolutely fascinating and was at a time in my life where videos like yours were interesting me into pursuing STEM education. Now, years later, doing my MEng degree and learning about thermodynamics, stirling engines, etc in university, so I came back here to recap (you explained it a lot better than my lecturer). Thank you for your contribution to the educations of myself and so many others
Struan Duncan
Struan Duncan Ай бұрын
Currently watching this for the exact same reason
TheClearsky88 Жыл бұрын
I have a degree in mechanical engineering from a respectable university. I did thousands of thermodinamical calculations using entropy. Yet, you helped me understand entropy better... thank you!
Quixote 3 ай бұрын
Did entropy increase when you substituted an “i” in “thermodynamical” for the “y”? Or, maybe you’re an engineer, not an English major :) ?
Wildfire 2 ай бұрын
I like how ppl complain about spelling, in a time when AI is almost ready to spell correct everything. Worrying about spelling is about the dumbest thing you can do. Also, I'm an astronaut millionaire.
vijay Ай бұрын
@Quixote 🤓☝️
SaintBrook 5 ай бұрын
You ought to do a video about that sodium acetate hand warmer you used. They’re really a pretty brilliant example of the latent heat of fusion given off when you have a phase change from liquors to solid. Orange farmers in Florida use the same phenomenon in water to protect oranges from freezing. They spray water on them and when the water freezes it keeps the oranges from freezing.
Jack Addie
Jack Addie Жыл бұрын
Thank you so much for this video Steve! Studying thermodynamics at uni right now, and this video is the ONLY one that I have understood. Physics, nature and our universe is just so beautiful, and your video made that ever more clear to me!
Graeme Morrison
Graeme Morrison Жыл бұрын
I wish we had KZhome when I did my physics degree thirty five years ago. It would have made many concepts less of a struggle to get my head around (And I probably would have got a higher classification!)
mama mia
mama mia 6 ай бұрын
Surely you would have known this before studying that at uni, right?
evilferris 2 жыл бұрын
This particular way of describing entropy is why you always find your earbud cords always tangled up: *there’s only 1 way* to have the cords straight and untangled but, as you jostle them around in your pocket or backpack, *there’s a myriad of ways* for them to become tangled.
Chris G
Chris G 2 жыл бұрын
I sometimes think earbud cords tangle even when they're not being jostled, just confined like in a desk drawer.
aleethan one
aleethan one 2 жыл бұрын
yeah but theres always lots of other orderly ways to have a pair of earbuds that aren't tangled. not just one...
Chris G
Chris G 2 жыл бұрын
Maybe entanglement is inverse to dimensionality. A loop in 3d becomes a knot when the dimensions are reduced to 2d under conditions of confinement like a backpack or desk drawer. Entropy means the knot or entanglement doesn't revert to a loop on re-exposure to 3d, so the cord is still in a tangle even after opening the desk drawer again.
Daniel Terra
Daniel Terra Жыл бұрын
that doesn't explain why you never plug usb the right way though
Lasse Sipilä
Lasse Sipilä Жыл бұрын
@Daniel Terra Sometimes you do, but it's less often than not, so that's what we remember. We're also tricked by our eyes, we think it should be a 50/50 chance that the USB is the correct way around, but it's one out of three: USB plugs are in fact four-dimensional objects, requiring you to turn it 180 degrees TWICE to rotate the plug to the superposition where it will fit the socket. ;)
Steve Wolfe
Steve Wolfe Жыл бұрын
I have that engine plus another Stirling. Now I know how to introduce my grandkids to entropy. A great explanation that helps one visualize. My intro to entropy was in 1967 2nd year thermodynamics in a classical physical sciences program. The prof was really good but visual props were limited to spelling out Noel complete with the 2 dots over the e in a pre-Christmas review of various equations
Richard Reynolds
Richard Reynolds Жыл бұрын
Always watch Steve's videos until the very end. Don't ever leave the video thinking it's basically over.
Deth Engine
Deth Engine Жыл бұрын
Thanks, Steve! I had the basic idea, but you really brought it home for me. And that was a nice tie-in to the heat death of the Universe.
Maanik Khurana
Maanik Khurana 8 ай бұрын
Hey mr.steve i really like your in depth definations the afterwards knowledge we have after watching your videos is just off the charts really appreciate your hardwork and thanks for educating these various complex yet beautiful topics hats off to you man
James Wack
James Wack Жыл бұрын
I just recently purchased a Sterling Engine model (and a Tensegrity Table) to Science educate my grand-kids (they'll face challenges greater than I've faced, and I'll be 'gone' in 20-30 years, optimistically). In the course of exploring, THIS post was suggested... and I've shared. Thank you!! I feel it was brilliantly explained and worthy of interest. Just sitting on a train, in a station, not moving yet... and an 11 minute compilation of Brilliance I just discovered when I needed it.
Kayla Evans
Kayla Evans 2 жыл бұрын
What I came for: better understanding of entropy What I left with: existential anxiety about the heat death of the universe
Phoebe Rose
Phoebe Rose 2 жыл бұрын
Yes yes yes that's what im processing too!!
Ana Almeida
Ana Almeida 2 жыл бұрын
Definitely 😂 Heyy, Kayla. I know you from your studygram :))
46 GOAT 2 жыл бұрын
don't worry you won't be around besides way before heat death occurs the Milky Way and our neighboring galaxy Andromeda will collide and our spec of a solar system will be no more. so don't fret ;)
PsychShrew 2 жыл бұрын
@46 GOAT I doubt that. There's a uniqueness to our home system and should humanity exist by then (and I very much expect it should) we ought to have the technology and infrastructure to keep such an important star safe.
Austine Declan
Austine Declan 2 жыл бұрын
You won't live long enough for it to become a problem so relax
Timothy Hughbanks
Timothy Hughbanks Жыл бұрын
I gave my Second Law lecture to my Freshman chemistry class this morning and that is exactly the way I say it too: increasing entropy is about spreading energy out. Our illustrations are at the molecular scale, but it always comes back to energy spreads out because states of the system that overwhelmingly most likely are those with the energy spread out.
muayyad alsadi
muayyad alsadi Жыл бұрын
Yes! This is what am talking about. Entropy is increasing not about disorder it's about fair even distribution or spread out. And this also applies to abstract things, for example a high entropy random generator is well spread out evenly. A high entropy checksum is also well spread out that a small change in input make much of the checksum to change into any possible value.
The Observer
The Observer Жыл бұрын
This has to be one of the best explanations for entropy I have heard so far!
naduah Жыл бұрын
I remember in high school a girl in my physics class concluded half jokingly that everything would eventually end up as heat, and the teacher agreed. Never knew that it was called entropy tho... Cool video!
Bull Compost
Bull Compost 4 ай бұрын
Absolutely great video! Not only your definition of entropy is, in my opinion, a lot better than the "measure of disorder" one, but also yours was the very best explanation of how the Stirling engine works (I love Sterling engines). Your way to explain stuff is second to none. Thank you.
Ron Stoppable
Ron Stoppable 4 жыл бұрын
I've always disliked "disorder" as a description for entropy, When energy distribution is homogenized, with everything spread out evenly, that's about as orderly as anything can get.
Mezmorizorz 4 жыл бұрын
I don't like the disorder definition because it's easy to misconstrue and doesn't do a good job of giving someone an intuitive explanation of entropy, but it is correct. There are more ways to create "identical" disordered states than there are ways to create "identical" ordered states, but at that point why aren't you just giving the actual and correct Boltzmann definition? It's really not that hard to understand. You can even use dice to explain it, there's only 1 way to roll a 2, but there's 7 ways to roll a 7. Entropy is defined as the the number of ways you can get a particular "big picture" measurement. When you randomly roll 2 dies, you're more likely to roll a 7 than a 2. Congratulations, you just described both what entropy is and why the second law happens with nothing more than something everyone has seen and addition. It's even easy to relate it to Shannon entropy from here. And after revisiting this video after a year, I still don't like it. Maybe it's useful for the way an engineer thinks about thermodynamics, but it's useless for how a chemist thinks about it. Give me the boltzmann definition and I can instantly see that solids are lower entropy than gases, but this one? That's not at all clear.
spwicks1980 4 жыл бұрын
It works when you're learning the statistical mechanical derivation of the Boltzmann equation. It's how we learned it at university.
Cain Morano
Cain Morano 4 жыл бұрын
It's a crappy description also because it's one word trying to represent a somewhat complex idea. I mean if someone asks you to define it you need to spend a little time explaining properly. If you are a professor standing at a chalk board you'd likely throw in some equations as well. And at the end of it, because as a society we have the attention of gold fish, we say something like, "Sooo... disorder?" And in frustration we say, "No, the answer is that thing I just took five minutes to tell you."
Ionlymadethistoleavecoments 4 жыл бұрын
Ron Arguelles that’s how it was explained to me as a kid.
ψ{Flame End Cyborg Guy}ψ
ψ{Flame End Cyborg Guy}ψ 4 жыл бұрын
@Mezmorizorz Bouth is in same walue...
Daemian Greaves
Daemian Greaves 9 ай бұрын
Thanks for this video! It is a much better explanation of entropy than the one we learned at school. Just a super nitpick (to be fair, you used the term ‘for statistical rigour’ so I think I can make this point!) but having all the red ping pong balls on one side and blue on the other is not just ONE of the possible arrangements because each of the reds are interchangeable offering a very high number of possibilities of red on one side (and of blue in the other side which are also self interchangeable). But even that high number of possibilities is thoroughly dwarfed by the number of overall possibilities, therefore we never see it. That being said, obviously, I know you were keeping things simple!
TennisCoachChip 7 ай бұрын
Yes and double that, because the reds could be on either side with the blues on the opposite side. But it is thoroughly dwarfed by the total number of overall possibilities. Statistics you are a cruel mistress! Great video thanks!
Ujjwal Gaur
Ujjwal Gaur 6 ай бұрын
Thank you for such an awesome explaination about entropy , we learn in our high grades just about the definition, not knowing the actual meaning of it .
DaltonEU1 5 ай бұрын
Thank you for explaining this so clearly!
The Pilot's Life
The Pilot's Life Жыл бұрын
What a kind, simple and entertaining way to explain things. Thank you, enjoyed it :)
Marc Rover
Marc Rover 6 ай бұрын
Great video. Something not mentioned in this video, which is also interesting, is the relationship between "meaning" and "entropy." In other-words, the more disorder something has, the more potential it has.
P Hampton
P Hampton 6 жыл бұрын
Entropy increases and so does my understanding of entropy, thanks to this video!
Steve Mould
Steve Mould 6 жыл бұрын
Lou F
Lou F 6 жыл бұрын
P Hampton I don't want to play with that fire too much, but there is following phenomena: syntropy. This the new organization. E.g. when one's organization gets bad, and it gets reorganized; etc...etc...
Erick Lopes
Erick Lopes 5 жыл бұрын
So... Battery charged: Low entropy Battery discharged: High entropy? So entropy is kind of the opposite of available energy?
Blaze 4 жыл бұрын
Erick Lopes yep
Anon54387 4 жыл бұрын
@Erick Lopes Usable energy anyway. I suppose that's splitting hairs, though. Entropy increases as one runs steam through a turbine and enthalpy decreases. Then one condenses it and pumps it back to the boiler where entropy is decreased and enthalpy increased so it can be sent back to the turbine to do more useful work. Enthalpy is order and thus usable energy where entropy is disordered unusable energy.
Llewelyn Bendtsen
Llewelyn Bendtsen Жыл бұрын
I like the ping-pong ball box analogy, as it's also useful for explaining Chaos. You could fill the box with half red and blue balls in the same way, and use a machine to precisely shake the box, then note the position of the balls. Put the balls back in their half/half configuration, and repeat the exercise. The chances are the balls will settle into a different position every time, and you never effectively predict where the balls will land. This system is chaotic. Now I think that arguably, if the balls are set up precisely enough, and the box is maintained precisely enough, and the machine shakes precisely enough, and the temperature is precisely maintained, and it can be isolated from all external interference, perhaps you could predict the outcome of the test, and get the same result each time. However even the tiniest change in any factor will produce wildly different results, such that we cannot conceivably engineer such precise conditions to make the outcome predictable, even if we had an inconceivable amount of analytical computing power. That is chaos.
Al Ger
Al Ger Жыл бұрын
Recently found, and subscribed to, your channel. Good goodness but this is a much more reasonable definition of entropy. You've added a bit of happy to my world. Thanks, dude!
Asha R
Asha R Жыл бұрын
I remember I've always been wondering what entropy really is because wether a room is messy or not is subjective, the word disorder is also kind of subjective.
Awestrike 6 ай бұрын
The degree of disorder that qualifies as messy is subjective, but the fact that "less disorder is less messy" is the objective part. If someone splashed paint on your wall it would be considered messy, until you find out their name is Jackson Pollock. In that case, there are relatively few random configurations that are similar to this highly specific, one-of-a-kind work of art.
Dylan Жыл бұрын
This was a better description. I was always puzzled by entropy being classified as disorder because disorder is just human defined
(•⁠ᴗ⁠•) 2 жыл бұрын
So about the pingpong box, if the red ones are all given a piece of ferrous metal and the blue ones are given non-ferrous ballast and you attach a magnet to one side before shaking, will the magnet eventually lose its magnetism and essentially "wear out" from use due to the force it exerts to sort the pingpongs? I'm checking out your three videos on magnetism now, but I think that's a topic that could use some more love from you! I have a hard time grasping electromagnetism in particular, so I hope you'll get inspiration for more videos on that general topic because you're one of the best folks I know with regards to explaining fundamental phenomena.
Ajay B R
Ajay B R 4 жыл бұрын
Sir, you are a huge clump of energy and enthusiasm!
Praveen b
Praveen b 2 жыл бұрын
But Steve is an exception to the rule - he spreads the energy around all the time, but it never loses its magic.
Chakri V
Chakri V 2 жыл бұрын
Once we watched this video and understood it and are as clever as him in this particular 11:42 mins of subject, we will not watch it again, does that prove knowledge or emotional entropy
Alex Embiric
Alex Embiric 2 жыл бұрын
Ranul Hashika
Ranul Hashika Жыл бұрын
I always had a problem with the general description of entropy "measure of disorder". Thank you for this video.
Stay Curious
Stay Curious 6 ай бұрын
Hi Steve. Thank you for always posting interesting content. This had my attention from start to finish. I have just one issue with your final thought. A closed container with the content at equilibrium will still have random movement and snapshots of the distribution of atoms would change over time. I think that time would continue even after equilibrium is reached. I might be wrong though. 😅
Anusha Kabber
Anusha Kabber 4 ай бұрын
Absolutely love your way of defining entropy!
J. Curtis
J. Curtis Жыл бұрын
At a chem undergrad level, I have always spoken of dispersal of both energy AND matter - the latter being helpful in illuminating the mathematical calculation of gas expansion entropy and entropy of mixing for gases or liquids (and same idea applies to heat energy dispersal via black body radiation emission).
Conrad Pinto
Conrad Pinto Жыл бұрын
Very late to this video as I discovered this channel only 2 days ago but damn, this was one of the best explanations of entropy I've watched/read. Subscribed!
ruchir rawat
ruchir rawat 2 жыл бұрын
This is the most intuitive video on thermodynamics I've ever watched. Thank you for finally making me understand what entropy is : )
Eviscerator18 Жыл бұрын
As always, your videos are fun to watch and greatly educational. Thank you!
Really informative video, makes the concept of entropy so understandable. Thank you.
vestborgelev 2 жыл бұрын
The ability to work against the laws of nature, rise up against gravity like trees and humans do or to consentrate energy locally like cells do, is one thing that I think separates life forms from dead matter. It is at least very fascinating that the few arrangements possible to construct these processes that work against gravity and reduce entropy, exists, when it is so so so unlikely, as you point out so well with the example of the red and blue balls. It's so fine tuned.
DZR NUTRITION 8 ай бұрын
Have been wrapping my mind around the unlogical definition of increased disorder and have been stumbling on getting the meaning really, until I saw this, thanks for this video really
Caleb Henry
Caleb Henry Жыл бұрын
Super well done! I love that definition!
Dragos Puri
Dragos Puri 6 жыл бұрын
Probably your best video yet. Very well explained, with great examples. Great job Steve! Waiting for the next. :)
Steve Mould
Steve Mould 6 жыл бұрын
+Dragos Puri thank you! I really like doing these explainer videos. Will do more I think.
VictorAndScience 6 жыл бұрын
I agree! This was beautifully explained. I am so glad I'm not the only one in conflict with the conventional definition of entropy.
Varad Sharma
Varad Sharma 6 жыл бұрын
Please do, they're great, this is my first time watching you(apart from brady's videos), and out of all the videos I watched on entropy(because I had difficulty accepting it) yours was THE BEST, even better than MITOCW.
Steve Mould
Steve Mould 6 жыл бұрын
Thank you Varad. Really appreciate comments like this.
Electro-Cute 6 жыл бұрын
This video explains thermodynamics wrong. It is obvious that Steve Mould doesn't understand the difference between temperature and thermal energy. If you have a material A with a very high thermal capacity next to a material B with a very low thermal capacity then A and B will try to reach the same temperature, but not the same energy dencity. So in other word you will find a huge gradient between the energy density of material A and B, even when they reach the same temperature. Lets say that material A is much more dence than B and both have the same bolume. This means that it is more likely that the energy will be transfered from B to A than from A to B. Because there is more mass in A than in B that can hold on to the energy. So in the end it is all about probability. It is more probable that the energy will be transfered to the material of high thermal capacity than the one with low thermal capacity. The most probable balance of energy depends on the laws that governs the universe. In the case of two simple materials like this it is governed by the laws that define the property of different materials. In a hypothetical case our universe could be governed by laws that we may not allready know of; very complex laws that states that our universe is allready existing in thermal equalibrium.
Deer 🦌
Deer 🦌 Жыл бұрын
I have been always confused about entropy until I watched this video. Thanks for making it
Fergal Byrne
Fergal Byrne 4 ай бұрын
An actually good explanation of entropy. Thank you 🙏
Scritch 11 ай бұрын
We need more of this series!
zaphod Жыл бұрын
Thanks a lot for this impressive explanation! I've been strugglin' to understand entropy for years! But I'm still struggling how to create a perpetual motion machine. Could you help me with that in your next video? (But keep it private?)
Chris T
Chris T 4 ай бұрын
Thanks for the clip! I've got a formal training in theor. physics including Ph.D., so I have learnt both the microscopic-statistical "measure of disorder" (correct but not easy to turn into useful calculation) as well as the thermodynamic, blackbox-process-motivated "state quantity that varies with dQ/T" (also correct, and more useful, but somewhat distant from getting an intuitive understanding). I keep struggling with forming an intuitive (yet quantitative and correct) grasp of entropy. Your clip helped, but I keep struggling. Energy is much easier in this respect. It's simply a conserved quantity.
Siddhant Chaudhari
Siddhant Chaudhari 6 жыл бұрын
As far as I know, out of all entropy videos, only this one mentions why the concept of entropy was introduced and gives a clear reason as to why entropy always increases. You are doing god's work my man. AWESOME explanation. :)
Steve Mould
Steve Mould 6 жыл бұрын
+Siddhant Chaudhari thank you :)
Veena Gawshinde
Veena Gawshinde Жыл бұрын
Such videos make me fall in love with science again and keep me motivated So yeah I'm thankful I found your channel 😀
Julia Vieira Saliba
Julia Vieira Saliba Жыл бұрын
after 20 videos I finally found one that is simple, complex and easy to understand
Michael Bourne
Michael Bourne Жыл бұрын
That was really interesting for this reason: given the amount of time the Universe has until it's heat death, that is enough time to allow for the statistical possibility that all the red and blue ping pong balls order themselves just once, and when that happens (if) then that would be a scary amount of enthalpy that could suddenly become available. Given that the Universe is finite yet boundless (and really, really big) I know that conventional wisdom says that it cannot happen but in all the time available there could be prolific pockets of enthalpy eruptions. I wonder if that actually happens quite regularly at the quantum level... I'm joking of course, since the discovery that entropy can decrease over time in a quantum system and quantum effects can be used to "clean up the states of systems". Interesting huh :) What I wonder is that if the quantum example can extrapolate to the macro system, or rather how it does that, similarly to how known quantum effects extrapolate to the macro universe we experience around us...
Jodi Diehl
Jodi Diehl Жыл бұрын
My basic understanding is a star being born from gravity is the clumping of entropy...
FJ B 2 ай бұрын
Michael Borne, If i understood the question, it Still wouldn't allow me an answer, ie: i don't know . . .
Teun Ай бұрын
Really enjoyable complete video answering all my questions. I just discovered this channel and I like it very much
Joshua Dunlap
Joshua Dunlap Жыл бұрын
Great simple explanation that really gets at what entropy means. I also like to think of entropy as what happens to energy as you move toward a state of equilibrium. At equilibrium, no energy interactions exist anymore. Similarly, energy itself is then a measure of how far you are from that equilibrium state.
John Smith
John Smith Жыл бұрын
"For a closed system." If you leave that out, you fail.
Sergio Rodríguez Cabezas
Sergio Rodríguez Cabezas 4 жыл бұрын
I watch this video before and after my thermodynamics class. Now I understand the video better but I have to say that you explain better than my professor!
Steve O'Hare
Steve O'Hare 2 жыл бұрын
The problem with Professors is that they think everyone understands what they are talking about instead of realizing in comparison to himself they are all a class of Chimps sitting in front of him, this is why I couldn't learn Algebra at school, I do understand it now as a good mate that could explain things the way Steve Mould does actually taught me Algebra it in about 10 minutes when I was 28 lol.
Baraka Thiongo
Baraka Thiongo 2 жыл бұрын
@Steve O'Hare congrats on finally learning algebra
Putin’s Gay Twin
Putin’s Gay Twin Жыл бұрын
Wow. He made entropy so easy to understand.
Reggy ReptinaLL
Reggy ReptinaLL Жыл бұрын
There are terms for piston positions, such as TPD top dead center, BDC bottom dead center. The foam block appears to working in the opposite direction of the cylinder.
TooMuchPowa Жыл бұрын
Really fun video to watch, made entropy easier to grasp.
John Connell
John Connell Жыл бұрын
That was a great explanation of entropy. 👍🏻
Shahid Meir
Shahid Meir 2 жыл бұрын
Being a mechanical engineering student. I have studied alot of thermodynamics and i found this video the best explanation of entropy. Thank you
j k
j k 4 жыл бұрын
I finally understand, after so many videos and articles - now, the clumped energy of my frustration has been dispersed! Thank you!
P Daddy
P Daddy 3 жыл бұрын
It would be very nice if there was a universal law that said frustration would always tend to become dispersed. It seems the opposite may be true.
Sandeep Mandrawadkar
Sandeep Mandrawadkar 2 жыл бұрын
Oscar Leite
Oscar Leite 4 ай бұрын
Amazing video Steve! One doubt: when you operate the motor in reverse mode, which plate will become hot and which one will become cold? (Assuming that in normal mode you just need a difference in temperature and not a specific plate to be colder or hoter than the other). Thx!
S.R. Жыл бұрын
Great video thanks. I am now wondering; How did the energies in the universe get organised in the first place?
Neil Hawkes
Neil Hawkes 7 ай бұрын
Very nice. The same thing has occurred to me. I am a research thermodynamicist, looking at buoyancy vortices as heat engines. Someone has to….😅
Avril Barker
Avril Barker Жыл бұрын
I love your videos and humour and I learn good stuff, thanks brother!
46 2 жыл бұрын
9:16 if you think about it, depending on how many balls in the box, there is going to be many more ways than one as each ball could rotate once within its own colour to give you a second way amongst I’m sure many more but, obviously the number compared to an even looking distribution is far smaller.
NZAdventureFamily 2 жыл бұрын
Steve you are so good at explaining difficult concepts! Could you do a video on pKa and pH please?
Charlie Merricks
Charlie Merricks Ай бұрын
Sounds weird but this video has actually helped with my biology degree...thanks a lot
SpookyAction AtaDistance
SpookyAction AtaDistance 2 ай бұрын
This fella has a smirk that is just absolutely infectious lmao. Also, the best description of entropy, methinks. Subscribed 😆
Pasindu Eranga
Pasindu Eranga Жыл бұрын
By far the best explanation of entropy on the internet
Gloweye 6 ай бұрын
My preferred definition was always "the uselessness of energy", since increasing it makes energy less useful. Which is pretty close to yours.
Saintpaty Жыл бұрын
Mr. Mould I'd like to make a correction to your information, when it comes to the internal combustion engine, it is explosive energy moving the piston down. The internal combustion engine, or if you'd prefer, the Otto engine, is ingeniously designed in such a way that has the pistons reset each other. When a chamber fires the piston is forced down, rotating the crank shaft, resetting it's fellow pistons, all in a fraction of a second. If air was able to shift from one side of the pistol to the other, the engine would not run. The same can be said for the Diesel and Wankel engines as well. Thank you for your time.
Angelo Collins
Angelo Collins 6 жыл бұрын
I'm an Aerospace Engineer, studied at the University of Maryland. This is by far the best explanation of Entropy I've ever heard. You get into another level of complexity when solving for Entropy (S) as a function of heat transfer (Q) and absolute temperature (T), but having this foundational understanding gives context to really comprehend your solution. Good stuff!
Steve Mould
Steve Mould 6 жыл бұрын
+Angelo Collins thank you!
tpgnRambo 5 жыл бұрын
Thanks a lot for the video! I struggled to understand what entropy really is, when I was first introduced to it at University (I’m still in first year physics). After watching this video it makes so much sense now! The way you defined it relating to the spreading out of energy helped me so much!
Seth 5 жыл бұрын
how is aerospace @ Maryland? I'll be applying to colleges next fall, for Ms. tsm
A Hitler
A Hitler 5 жыл бұрын
sorry but the earth is flat
IIKillGuyII 5 жыл бұрын
Information spread over degrees of freedom to be more specific :p
Ganesh Bhujbal
Ganesh Bhujbal Жыл бұрын
Thanks for sharing this video, very well explained the entropy.🙏
Lea Жыл бұрын
Awesome video! Love the explanation, makes you think about renewables. Energy from the sun also creates the wind etc. Not sure how tidal fits in though, if we use too much tidal energy will the moon fall to earth ?
SKIP L Goebel
SKIP L Goebel Жыл бұрын
Great explanation. Now, does it apply to poli-tics?
Leonard Bernd
Leonard Bernd Жыл бұрын
Holy shit, this opened a door in my head. Right now I feel like this concept is applicable to everything in life, even metaphysical stuff like art and music
GetMoGaming 2 ай бұрын
So would that external combustion engine slow down as the heat propagates to the top plate? i.e. Could I use its rate of rotation to roughly measure the heat of my radiator or heater?
Allan 2 жыл бұрын
My favorite definition of entropy cames from Shannon which roughly is the amount of information of a system, or how much you can compress information in a system. This is also consistent with the entanglement network we have as our reality, and its information increase over time attempting to "write" information on its state.
Thomas Harris
Thomas Harris Жыл бұрын
Yes. There is a great story about that. I think it was von Neuman who suggested that they call that Shannon's phenomena Entropy because of the similarity to the equations of (mechanical) entropy. So Shannon Entropy was discovered later and was only called Entropy as an analogy. But really it is more fundamental I think. You can explain thermodynamic Entropy in terms of Shannon Entropy but you can't really explain Shannon Entropy in terms of thermodynamic Entropy.
Code Bit Cookie
Code Bit Cookie Жыл бұрын
This video finally cleared my doubts. Thank you.
Tobias Reckinger
Tobias Reckinger Жыл бұрын
Our Thermodynamics Professor gave us a good mnemonic for S=Q/T. We should imagine the Entropy as the number of Ships (S) needed to transport a number of Containers (Q) with a Transport Capacity (T) per Ship. It sounds a little bit simplistic but it works for the most parts of Thermodynamics.
Leo Bieker
Leo Bieker Жыл бұрын
This really puts into light how terrible my thermodynamics teacher is at explaining this lol. Thanks!!
jdanielcramer Жыл бұрын
Well done, that Sterling Engine is really cool, but I’m surprised that the air inside of it is capable of expanding and contracting so quickly? 🤔
Dr. Cygnus Laboratorys
Dr. Cygnus Laboratorys 2 жыл бұрын
I love your definition of entropy
Veronica Taylor
Veronica Taylor 3 жыл бұрын
I want someone to look at me the way Steve looks at his Stirling engine
Michael Harris
Michael Harris 3 жыл бұрын
I'd never have thought of that! More like "why doesn't he take his face out of the way so I can see the engine". Thank God for the difference.
The Mask
The Mask 3 жыл бұрын
Well he looks at the engine so he can figure out how it works. But no matter how long a mans observations of a women, he knows he will never figure her out.
Clutch Inson
Clutch Inson 3 жыл бұрын
@The Mask you have touched on an excellent point..in fact females or shall we say gynovoltaic engines have typically taken all of the energy i have ever given them and efficiently shared it with the rest of the universe..relieving me of the burden of storing it. Thankyou ladies!
Sean Smith
Sean Smith 3 жыл бұрын
@Clutch Inson. I too have pumped a steady stream of explosive energy via ‘small bangs’ into a continuous array of gynovoltaic engines over time in my endeavour to understand the nature of the universe and experience entropy first hand.
Clutch Inson
Clutch Inson 3 жыл бұрын
Sean- one of my small bangs has grown big enough to borrow the car ! May you continue your explosive research..and may your experiements confirm and exceed your wildest hypothesis.
Silviu 4 ай бұрын
could you place the hotter plate in the sun and the colder slab in the shade to make it solar powered? also, could you connect the colder slab to a huge funnel to concentrate air flow around (too cool it down) also, could you make the wheel look a little bit like fan to promote airflow around the top slab (to keep it slightly colder than the hot slab)
zahid babel
zahid babel Жыл бұрын
Measurement of dissorder seems abstract for me. Your explanation with this different way is better for me to understand. Thank you
Jason Parker
Jason Parker Жыл бұрын
Thank you for this video. The "your teenager's messy room" metaphor for entropy has done more harm than good in my opinion. It needs to die a quick, painless death. At 6:25, where you're running it in reverse, I would point out that even if your muscles weren't dumping heat into the environment (which they are), the net entropy change would still be positive because more heat is rejected at the hot plate than is drawn from the cold plate. Energy from the flywheel is being dissipated (or spread out) as heat at the hotter temperature. The second law never has to operate on credit :)
Flaming Burrito
Flaming Burrito 5 ай бұрын
I always understood entropy as stability. Once full entropy is achieved, the universe will reach a completely stable state, no change in energy, no reactions, perfect uniformity and stability across the board.
Secret Life of Matt
Secret Life of Matt Жыл бұрын
Actually, in his short story "The Last Question", Isaac Asimov explored the idea of entropy and how the problem of the heat death of the universe might be dealt with...
brekko 6 жыл бұрын
And here we find our Hero Cpt. Mould struck by the insane desire to clear up a basic physics concept during his daily train commute.
Electro-Cute 6 жыл бұрын
This video explains thermodynamics wrong. It is obvious that Steve Mould doesn't understand the difference between temperature and thermal energy. If you have a material A with a very high thermal capacity next to a material B with a very low thermal capacity then A and B will try to reach the same temperature, but not the same energy dencity. So in other word you will find a huge gradient between the energy density of material A and B, even when they reach the same temperature. Lets say that material A is much more dence than B and both have the same bolume. This means that it is more likely that the energy will be transfered from B to A than from A to B. Because there is more mass in A than in B that can hold on to the energy. So in the end it is all about probability. It is more probable that the energy will be transfered to the material of high thermal capacity than the one with low thermal capacity. The most probable balance of energy depends on the laws that governs the universe. In the case of two simple materials like this it is governed by the laws that define the property of different materials. In a hypothetical case our universe could be governed by laws that we may not allready know of; very complex laws that states that our universe is allready existing in thermal equalibrium.
Walrave 6 жыл бұрын
Electro-Cute high energy density doesn't mean it will transfer more energy to a material of lower energy density at the same temperature, it just means it has more energy states accessible to store energy. Two touching materials at the same temperature will have an even energy transfer in a closed system no matter what their heat capacity is. Their energy content will not converge unless the materials themselves decay into each other to form a homogeneous spread of atoms.
Electro-Cute 6 жыл бұрын
I know that, it was allso kind of my point. Temperature is a thermodynamical perspective on a very simplified system. What the guy in the video said was that the systems will reach equal thermal energy distribution (or at least that is how I interpreted it). But that is only true for few special cases.
Andrew Robertson
Andrew Robertson 6 жыл бұрын
The context of the discussion and accompanying diagram make it clear that he is talking about two identical slabs of the same metal. He could, of course, divert to say that the thermal energy distribution would be different for slabs of different material but that would be unnecessary for this discussion (he's not talking about the relationship of thermal energy and temperature) and make the discussion overly complex.
Mezmorizorz 3 жыл бұрын
@Andrew Robertson I don't agree that this is obvious, and even if it was how does this explanation explain what happens when the two metals aren't the same? That's not at all obvious to me, and at this point I've had about two years of thermodynamics classes ranging from gen chem to graduate level statistical mechanics. I don't see how someone who is totally ignorant of the topic is supposed to arrive at reasonable conclusions from it. But really, the most damning thing is that this video simply isn't an explanation for entropy. What he is describing is not entropy. He is describing a consequence of the concept of equally probable microstates that happens to work well for the few systems he described and few others.
My My
My My 2 ай бұрын
I think Time is better defined by cause-and-effect. Effects always follow causes which gives Time its direction.
drakedbz Жыл бұрын
I wonder whether you could use a sterling engine to power fans, such that the heat from a CPU would power the cooling of that cpu. I imagine it wouldn't do a good enough job, or we would see that everywhere by now.
Keinan Navot
Keinan Navot Жыл бұрын
I’ve watched so many videos about the issue and read a lot!! This is by far the most coherent and brilliantly visualized explanation.
Tarun KS
Tarun KS Жыл бұрын
This video is highly recommended for high school students like me. Great explanation!!
Wall00 Жыл бұрын
Thanks for a good explanation of Entropy. I have read and heard many bad explanations in the past.
Creede Caldwell
Creede Caldwell 2 жыл бұрын
Great explanation! Another fun tidbit is that "entropy" is also used to describe how much information is encoded in something. This seems counter-intuitive at first when compared to the heat death of the universe, but it makes sense if you compare it to Steve's example of the balls in the box. For example, your hard drive is in a more orderly (less entropy) state when it's empty and all the bits are zeroes; when you fill it with data it has more information but you also can't easily predict if any given bit is a zero or a one (more entropy). James Gleick has a great book on this for those with some "temporal entropy" to kill.
Belisarian 4 ай бұрын
Indeed, I heard something similar when talking about compression of data. In short more you compress data, more you are reducing orderly, predictable parts, which means if you compress something to maximum then all you are left with is pure chaos.
37parman Жыл бұрын
Best description of entropy I’ve watched. Thanks
Observ45er Жыл бұрын
There is not only one arrangement with all red on one side. Because the same colored balls are all each a distinct ball. When they are all on one side, you can still move them around into many different arrangements. Likewise, the other colored balls also have many different arrangements on their side, so you have twice as many arrangements with all of the balls of each color on one side. Therefore, it's not quite as simple as only one arrangement of the two colored balls separated on their own sides.
Phil Clark
Phil Clark 4 ай бұрын
Interesting side thought is how the initial tank of energy in the universe was initially provided and why it has not reached total entropy if always existed.
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