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- เผยแพร่เมื่อ 26 มิ.ย. 2024
- The ‘Second Law of Thermodynamics’ is a fundamental law of nature, unarguably one of the most valuable discoveries of mankind; however this law is slightly confusing for most engineers or students. The main reason for this is because it has so many complex terms in it and that there are many ways that this second law can be stated, but most importantly, the majority do not understand what are the applications of this law. In this video we will create a real physical insight into this law with a minimum use of mathematics.
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Very interesting but.....what exactly is the second law of thermodynamics?
States that hot objects cannot absorbed energy from the surrounding but it only releases its own energy
it's the one that comes after the first law
The second law of Thermodynamics is that: Any process in nature occurs in a certain direction only.
This does not condemn the first law of energy conservation.
We are in league lol
@@MA-qz1sd 😂🤣🤣😂
I am very pleased with the writing and structure in explaining the concept. Sometimes hard things to understand are just not presented right. 👍
Thank you for clarifying this! I had a hard time understanding how to use 2nd law formulas but now I can confidently apply them. You sir are the reason why I will pass my final this monday!
Did you pass?
@@Football_Eyes passed and graduated college
One of the greatest things I learned was to ask the prof a question once, keep my mouth shut if I didn’t understand, then look it up on TH-cam later by a competent teacher.
As a mechanical engineering student I find this vid very helpful! thanks again LearnEngineering, and the video editing wasn’t half bad ;)
During this entire video the law is never stated.
They provide multiple formulations
But it is still isn't explicitly stated.
Thank you for that.
#Entropy for a closed system ( like the universe ) , is always increasing .
#A self-occurring process, the entropy in the final state is greater than the entropy in the initial state.
#Heat is transferred from a body with a higher temperature to a body with a lower temperature.
The substance goes from higher concentration to lower concentration .
To do a work we need a delta ( difference in heat , or in substance concentration ) ; second law of therm-dynamics kills delta . *Life is struggle with second law of thermo-dynamics .*
It is the one who wins in the end .
Wow simply mind blown!!! I've seen this before in high school and never really got the idea behind of Gibbs free energy, thanks a lot
Free energy! Really?
including the clausius inequality? my high school could never
@@4001Jester im in high school right now, we did Gibbs free energy but not the Clausius inequality haha
@@puddleduck1405 we did pythagoras and pi r ^2 at high school
Everything was going well until he went entropy equation mode.
haha IK right
@@007adulrekha3 jai hind 🇮🇳🇮🇳🇮🇳
Ik haha lol but its pretty helpful tho
I dont like entropy but its making it usefull
“with a minimum use of mathematics”
*defines 2nd law with a line integral*
My guy this isn’t lego building you need math for engineering.
😂😂
@@vahagnyengibaryan4253 😂😂😂😂😂😂
a very perfect explanation for the physics behind the law, i listen to the video 3 or 5 times and finally I can say that now I understand the second law of thermodynamics
We will use no math here. Proceds to use only math
he actually said no *complicated* maths, oh wait... 5:05
both wrong.. he saaid minimum use of mathematics.. i stiill did not understand,, and frustrated me bringing the universe into it,, as it that was simple
I guess his definition of complicated isnt the same as yours lol
@@tijerinaivan Actually by universe, it doesn't mean we are talking about the entire cosmos including the galaxies and space. It's just used for the 'system' and 'surroundings' together.
And that is why entropy change of the "universe" is the sum of the change in entropy of the system and that of surroundings.
Brilliant channel. Lots to learn. Kudos to the team.
Excellent instructional video that allows to approach an abstract theme with the minimum of mathematics. Concerning physical phenomena, it is better to "feel" them before handling them with maths. Thanks a lot
One of the finest video I have ever seen on this topic. Nice explanation.
You call this presentation "a minimum ues of mathematics"? You're dreaming. This is a highly technical explanation and is for people who already understand the second law.
I agree that saying “minimum use of mathematics” is pretty misleading, and it’s probably best used as a review for students. BUT i found this video very useful in completing my understanding of the second law rather than reinforcing concepts i already understood
Never knew, now I do :) Thank you Learn Engineering!
Keep up the good work this really helps to get a better idea of thermodynamics even if you have studied it before
Wow....sir ...i was just waiting for this animation video....i m very happy.....and a lot of bless to u for helping engineering students
Thank you for your detailed explanation. After watching no.of times now I got an idea about second law
best video for understanding the second law wonderful explanation man!
I couldn't understand entropy in whole semester and this dude explain me in 7 mins 😊😊
This video is very good if you're an engineering student trying to solve entropy problems. Philosophically understanding it though, not so much. The 2nd Law just states that entropy or the disorder of a system tends to increase with time. Fundamentally it just means there are far more solutions where the result is a mess than an orderly one.
Think about a game of pool. Originally the balls are nice and orderly, but once things start moving, the balls end up all over the place. Now imagine trillions of particles doing the same thing. It is possible for entropy to decrease spontaneously but the chance of that occurring is practically impossible.
This law is not so much a product of physics (like F=ma or energy conservation) but of statistics. It's an emergent property that comes about because there are far more states where a system is disorderly than orderly.
To get even more philosophical, there is no ORDERLY or NON-ORDERLY in the universe. It is there only in our minds. The pool balls are orderly only for a person who knows what pool is. For an alien from a planet where balls are prohibited, that particular arrangement would be just as disorderly as anything else.
So now our second law's statement changes from a "ORDER ---> DISORDER" process to "SOME RANDOM STATE ----> SOME OTHER RANDOM STATE". It simply states that one state will move to some other state with time. If we cannot model the system exactly, after a time we will not be able to predict what that end state would be. So we end up with a lot of possible end states.
So at the end what the second law says is "as time goes on states change, you can't expect things to stay the same. When more time passes, you will become less and less likely to predict what would happen".
So the simplest statement of the second law is "time passes. things happen"
True. Unfortunately though the 2nd law is wrong in the sense that it is dependent on the boundedness of the observer who’s looking at the system.
You can imagine the space of states tending towards an increase in entropy statistically in such examples (particles in a box) because the system takes the states-space to always be more (have more degrees of freedom) than the number of particles themselves.
For example. You have 10 2dimensional particles, on a 10x10 grid, then there will always be an exponentially higher number of possible states the particles can be in and most of those states will be random in their distribution. The underlying state-space however is not in equilibrium, in fact it is highly ordered. You can imagine that if you interpreted each 2d particle as a black pixel(1) and every pixel that isn’t a particle as a white pixel(0) then the total system would be 000001000000000000100000….and so on. This is a highly homogenous distribution and *not* random.
The 2nd law is therefor an artifact of how the observer parses the system…where if the observer could resolve the whole statespace they wouldn’t see an increase in entropy it would in fact never change…where as when you parse the system where you lose information it will appear that the 2nd law is true.
It’s like ignoring the air molecules in a double pendulum experiment. Of course the 2body system will appear chaotic because one is simply ignoring and not taking into account the actual components of the system (air molecules).
Cheers,
Thank you so much. Very clear and simple.
Brilliant explanation. Thank you
Thank you for using as little math as possible,.... I may have gotten lost if you would have used nothing but math. Sure glad THAT didn't happen,... *: )*
Sarcastic
Great video. Thought I understood LT2 but this is great insight.
Best explanation of entropy and Gibbs Free Energy that I’ve ever seen!
I knew more before I watched the video
Wow you’re a genius!
I have no clue what this video was talking about
Now you know less.😂
we all do tho its mean we understand less
Maybe that is entropy?
I shall have to look at this video again. Lots of information to get my head around. I liked the info about Entropy .I did not know that before seeing this video.
"you need not to worry about what is happening in the surroundings" … but (T) in the Gips equation is the surrounding temperature !!
Thank you so much. It was much much easier to understand!
Thank you very much sir for such a crystal clear explanation about second law and entropy. A thanks from deep of my heart. 😊😊😊😊😊
Excellent explanation, thanks.
Awesome... Love your videos guys...
Excellent work done dude thanks for this free knowledge transfer
Well,only if ∆S is negative!
Thankyou a thousand...... I'm suffering so much to understand this. Now I have a clear picture on entropy and the whole law. Please do a video on exergy. 💯💯👏🙏🙏
Really appreciative
I love this channel its just awesome..
thank you much for posting this.
Good one Sir. U r examples were awesome.
JUST ANOTHER GREAT IDEA .... AND A NICE VIDEO ....!!!!! KEEP GOING ...
Good with practical examples
Wow amazing thank u now I got a clear idea why shall we study about entropy and especially how can we use it
Thankyou for the explanation 🧡✨
Comments make me feel sad for the creator, he did a great job.
well explained! good work.
I thought I was confused before. Now I am definitely confused
This video is very insightful
Great vid! Is the Temperature in the expression for Gibbs free energy that of the surrounding?
Thanks alot for video really understand in 6:55 min ....very helpful
thanks for the hard work
Thanks a lot for this video
thank you sir for clarification
Dhnayvad brha nice video every thing is good 🙏🏻👌
¡Thanks to you my friend!
You're doing a great job
This video was very clear and understandable with the explaining. I want to design fuels and energy sources, so thermodynamics is an important subject that I can learn from your video's
*videos
Very well explained 👍
Tank you for this video
Awesome and very knowledgeable video
So what I understood from all this is that energy always flows from "high to low", never the other way. Like water down a mountain. So any closed system that has any amount of entropy will always want to flow to 0. Any open system into which outside energy can be added will have entropy increase until that extra added energy is supplied no more, like a melting glacier adding water to a river, and once again it will go from "high to low" until we get an all stop at 0 entropy. All the water from the mountain has flowed. Or something like that.
The way you described it just sounds like only ‘ loss of energy’ to me and it doesn’t seem applicable to these laws
great channel .I like very much this channel because I like scientific explaining ......
Amazing.. thanks
Thank you very much
Its a great simple explanation.👍
Nice explanation with best animation.
We also use these pumps in Iran, and our company specializes in repairs, winding and turning parts of these pumps, and we have been working in this field for 40 years.
Good explanation thank you
👏nice explanation
Wow thanks team it helped me alot
Excellent!!!
GREAT VIDEO. Can you do a video on how radars work?
Awsome! Keep the good job! 😅
Thanks dude
To be precise in the bottle where there are the two chemicals it should be used Helmholtz energy (A) since it is an isocore instead of in isobar process
thanku sir.......awsome explaination
Very good explanation..
1:37 states 2nd law is related to the direction of chemical processes while first law depicts the law of conservation of energy
2:45 states mathematical eqn. for 2nd law that total Entropy of an isolated system can never decrease
Great video man, dunno why people here are complaining. Its a 7min supplementary youtube vid, not supposed to act as a replacement for the textbooks
I must say you a great knowledge
Nice explanation
Great vedio！
Wow it's amazing
this helped so much!!!!!!!!!!!!!
Love the animation.
Simple, but very useful (y)
Excellent...
This is really helpfull
Ooh hooh thanks again 🙏
The statements of the second law you crossed out are in fact the most useful for an engineer as they allow to develop intuition about the underlying physics. Formulae are an elegant way of stating laws of physics in the language of mathematics but that is not necessarily useful for understanding every day technical problems. The same applies to the abstract idea of entropy.
I think it’s stated that way in the sense of how some learn subjects! Some can’t apply ‘ intuition’ and ‘ abstract thought’ to math like
Others can! That’s definitely how I understand math! If you try and tell me to just learn numbers I simply can not lol
Thank you
loved the video
From first law of thermodynamics we know that the total energy of the universe remains conserved that is the sum of the energy in in system and surrounding before and after the reaction is conserved but a question should arise in our mind that what is the direction of this flow of energy is it flowing from the system to surrounding or the energy is flowing from the surrounding to system so this direction is given by the second law of thermodynamics.
It's a mathematical analogy
But in simple words you can understand it as if gibbs free energy of a reaction is less than 0 the reaction is spontaneous that is it does not need any external energy source that is there is no flow of energy from surrounding to the system so we can conclude that the energy is flowing from system to the surrounding
I love your videos very much sir.....love from India
Very Nice
Superb video
Superrrb Awesome Fantastic video
Good explanation
Thanks 🙏
thank you
u made me more confused more than ever. thanks