Thermodynamic Entropy

eCHEM 1A: Online General Chemistry
College of Chemistry, University of California, Berkeley

Curriculum and ChemQuizzes developed by Dr. Mark Kubinec and Professor Alexander Pines
Chemical Demonstrations by Lonnie Martin
Video Production by Jon Schainker and Scott Vento
Developed with the support of The Camille & Henry Dreyfus Foundation

[saddlenode]

Searching a while to figure out why entropy keeps increasing, for quite sometime; he nailed it in much simpler way.

[DANGJOS]

This guy is the PERFECT teacher!! well done!

[weisenhm]

These little chem vignettes are really true gems! They are so concise on pretty complex topics and I have a feeling that as more viewers stumble upon this particular video series, as I did, that you will have many more fans. I encourage you to keep posting more and develop the echem1a web site as well. These are fantastic!

[teachingengineering]

It is wonderful to hear different perspectives on the subject of Thermo!

[iqrarehman]

you are a perfect teacher because I love physics

[andrewcorrie]

Phew: relieved to see that integral introduced at the end (since the heat energy, q, is not transferred at a constant temperature either for the hot or the cold body).

[BitwiseMobile]

Entropy seems to be related to statistical probability in that lower entropy means a lower probability of the system spontaneously assuming that state. The higher the entropy the higher the probability the system will spontaneously assume that state. If we assume that entropy is a statistical probability then that means Gibbs free energy is based on a probability as well since Gibbs = H - TS where H is enthalpy, T is temperature (in kelvin), and S is our friend entropy.

[HaiderKhanZ]

Agree with others - He IS THE PERFECT CHEM TEACHER

[reubenschmidt]

This is so much better than the explanation from crash course >___< Keep up the great work! 

[candiaalx]

I need to watch this again when im sober

In a classical system energy cannot be “dispersed over microstates” because a system is only in one microstate at a time. The entropy measures how many possible microstates the system could be in. Those microstates in which the energy is dispersed among the particles of the system are overwhelmingly more common.

[anilsharma-evmy]

Entropy increase as number of permutation and combination increasing on and on
What a simple explanation from India

[sunehrikiran]

that is helpful . .. answer to some of my questions related to entropy .

[smhemant]

Please make a playlist of these videos

[egidijuskuprusevicius]

dV=dW/p means that p=const when W is changing causing V to change by relevant amounts, so what do mean dS=dQ/Th and dS=dQ/Tc relating to his gogelmogel? It should mean that at Th temperature if we give or take out dQ we will get change in S smaller than in Tc case, but in his case T is changing in both cases

[mikebellamy]

Yes quite good except for one thing: Entropy is *NOT DEFINED* by the equation for entropy change (sum of dQ/T). That equation is an *APPLICATION* only valid for systems involved in heat transfer and at equilibrium.

[faj]

thank you .. now i know how to calculate entropy ..

[gooddeedsleadto]

Could u do one lecture on reversible & irreversible expansion & compression using PV diagrams & explain why u use external pressure in the case of irreversible expansion & could u show it step by step by removing the weight half of it each time. Show how the work gradually changes from a curve to rectangle after each step.

[rohitratan]

Sir It would be a great help if you could explain why the term TS is subtracted from H in Gibbs Helmholtz's equation. What is it's real significance.

[Shihyx]

entropy is a natural variable in terms of heat instead of work. for a heat transfer process. Tough the energy leaved from the hot panel is the same with that entered into the cool panel. the enery/Thot + energy/Tcold is always positive