Anybody else notice that the further you go down the chem playlist the fewer views there are? Quitters.

you are definitely a GENIUS! you can simplify all the topics and make it understandable in our level. you can convert all the technical stuffs into layman's terms! thanks for your generosity! :))

Like Sal explains in other videos, that formula is not applicable when the transition is not reversible. In this case, the expansion is not reversible; thus, although no heat is added, the entropy increases.

It appears that this is an old video. It is really nice how the tutor is hammering on the point that entropy is a macro-variable. However, I would like to point out that when someone talks about a system of higher disorder having higher entropy, they are not necessarily associating entropy with a particular micro-state, which is apparently what is implied in this video. Systems with higher disorder tend to have the ability to take on more micro-states and hence higher entropy.

the thing he wants to convey us in this video is "entropy is depended only on small particles (kinetic energy,etc) and not on randomness of large particles

uh i get it! So the reason why water vapor is said to have higher entropy than an ice cube is because the gas molecules can be in many places since it can move freely, as for ice cube, it can only vibrate.... hence it tends to melt, therefore achieving a state of higher entropy :) I LOVE U

A correct connection to the clean/dirty room model would be: Macrostate1: All toys are tydied up in a drawer. In the rest of the room, there are no toys. Inside of the drawer, there's no kinetic energy, so the temperature is low. Now, the system is brought into macrostate 2: The drawer is opened => Volume is increased. A child enters the room => Heat is added :-) The child takes out all toys and throws them around in the room. (We don't care where exactly the toys fly around.) => S increased.

@universalspace3417

5 жыл бұрын

what does the toy represent? please i am finding it difficult to understand entropy. And how it is related to second law of TD and how second law is related to irreversibility. i need help please.

Henry Poincare named the conception of "entropy " as a " surprising abstract " Lev Landau wrote: " A question about the physical basis of the entropy monotonous increasing law remains open " One physicist said : " The entropy is only a shadow of energy“ # History of Entropy 1 - Clausius : dS= dQ / T. 2 - Boltzmann : S= k log W 3 - Planck : h*f = kT logW # The formula of Entropy is : h*f = kT logW Israel Sadovnik Socratus

thanx for focusing on micro states.. it was really very important...

I confused this myself. Thanks for this!

Thank you man!! a lot!!

Hey Sal, I think you might be making a misconception between a cluttered/uncluttered room vs a clean/dirty room since a dirty room has more dirt and thus more overall particles. Therefore wouldn't the entropy in a dirty room be greater?

@riturajborah382

9 жыл бұрын

Aman Singh No .. he is only talking about the orderliness..

Hey Sal. I have a question about how you defined entropy. You said that entropy is the amount of states that a specific system can take on. You also said that it is a misconception for people to point at specific particles in a system and try to find the entropy. However, could you define a specific particle as a system and find the entropy of that single particle system? I may have some misconception in my question, but I feel that it would clear my understanding of entropy if this question is answered. Thank you for your wonderful videos.

If entropy is number of states by definition, how does a temperature change that? i mean, particles moving around faster would make them 'visit' more states in shorter time periods, but that doesn't increase the number of possible states that they can have. I'm really confused

@joeya6635

5 жыл бұрын

States not only include places a particle could visit,but the velocity of the particle is also a state

If Entropy is only defined for a system in equilibrium, then how can we talk about the entropy of the universe (e.g. 2nd Law of the thermodynamics), since the universe isn’t at equilibrium? Thanks for the great videos!

yup

Oh my god. I feel enlightened

@akhilkumar3090

3 жыл бұрын

Lol

Could I assign entropy to fate as a system? In which people are the particles bumping around influencing one another? Can I say I have higher entropy the more people are in a certain area?

@Mendelevium146 That is the CHANGE of entropy.

When you say "formula", are you referring to dS=Q/T?

I don't understand. Did he say position of molecules is a state and can not be used as an entropy? And then he switched atoms for cards and described entropy by the position of those cards? Let's have a closed system: a series of rectangles each containing N molecules, the rectangles don't intersect. If you move those rectangles around (without intersection), the entropy of this system does not change. So how come stacked cards have less of an entropy that randomly placed cards ? Unless you meant to say that the closed system volume is the volume of sphere containing all the cards. Which defines macro variable by a microvariable ? Which is a misconception as he said ? If volume of the closed system is automatically defined by the position of it's entities, then the entities' position can be anything. Thus even in this case. Entropy of stacked and randomly placed deck is the same. Anyone ? Please ?

@noneofurbusns3139

8 жыл бұрын

+aeroson I don't get what you said at the end but he said that even if he didn't drew the position of the molecules he would explain the entropy. Because in the smaller box aka 'system' the molecules can not take as many states as in the bigger one, so == > more states (if V bigger= molecules can take more scenarios , T higher= molecules vibrate more, etc) => higher entorpy. Correct me if i'm wrong

@noneofurbusns3139

8 жыл бұрын

+aeroson as for the cards in 5:46 he said, that's not the case because the molecules are in the same state

@jakubnei2195

8 жыл бұрын

+Eris sire Ah I see thank you. Also you said "T higher = molecules vibrate more => higher entropy", temperature is state of the molecules, so I think you are wrong there, this is probably right: "Higher available maximum temperature of molecule in system" => higher entropy.

@noneofurbusns3139

8 жыл бұрын

aeroson If the system has higher T the molecules would vibrate more.. so T, V, P etc describe the system right?

@jakubnei2195

8 жыл бұрын

+Eris sire So I can say this about everything: if system has higher velocity it has higher entropy ? The velocity of mlecules is higher, so it describes the system ? I think you can not simply say velocity, you must say something like maximum velocity of each particle, or average velocity of all particles is something. But if you say this about system you can not compare it's entropy with system about which you didn't say anything about velocity.

@ThePsychrometry haha thts funny...he deserves it :d but seriously numbering the videos would be very helpful...I tried looking at the dates it was uploaded but most of the related videos has been uploaded on the same day so then it gets very confusing ;/

can you put those videos in order? if you give numbers, it would be more helpful :) if i graduate, i'll put your name on my diploma too, im serious, thanks :D

4:14 so would that be a 'closed system'?

ur saying that to a expert in science...the irony

Too much messing about! Just get to the point and have the graphics ready

HE TALKS TOO MUCH. HIS MAJOR ISSUE.