Diffusion - Coefficients and Non Steady State

A Materials Science lecture that introduces the calculations of Diffusion in solids. An introduction to the concepts is already assumed.
The hurried nature of the recording resulted in some quirks, for which I apologize:
- The audio level is somewhat low.
- Half-way through, the audio and video are a few seconds out-of-sync.
- In one problem, the Boltzmann constant variable "k" is mistakenly used in a formula where "R" should be, though the correct value is used.
Let me know if these are problematic and I will try to edit it or re-record it.

[@lawofrobotics]

Definitely one of the best videos I've seen on this topic. Thank you.

[@JamesVestal-dz5qm]

I explained this to my dad while we went for a walk yesterday morning.

[@pradipdalui5008]

My concept totally cleared and I can solve all problems related diffusion in solids easily after viewing your video sir,,I really very much help from your class,wish your long life sir

[@kawsarchowdhury1822]

how did you get erf(z)=0.8125??????

[@boxiao6586]

Thanks professor. I have a question, could you tell me the diffusion coefficient of Cu in ferrite steel?

[@sajakareem8277]

Please can you explain the pesudo steady-state time equation?

[@fouadj1893]

Wow i actually learned something Thank you so much

[@ajs8194]

Thanks for helping me solve my assignment ;)

[@qasimtanoli26]

thank you it was really helpful video

[@fs8566]

Thank you so much sir..

[@Pattelito]

Thank you! this helped me alot :)

[@EngineeringandDesignSolutions]

No problem! Thanks for posting!

[@nehauk9314]

Qd is fixed?

[@yosefputera4266]

Thanks, man!

[@jeffbirt6671]

You are welcome! Thanks for watching and commenting!

[@mmolokimotlhobogwa5983]

thank you

[@user-ce3nx2vu9i]

Thanks so much

[@EngineeringandDesignSolutions]

No problem! Thanks for posting!

[@sloom121]

Thanks

[@EngineeringandDesignSolutions]

You are welcome!

[@hasibarian3588]

sorry, maybe i'm confused or something but this was very unclear explanation. when you show us how to solve for D (inital). you didn't mention in the video that you had to multiply the boltzmann constant by avagadros number and i still don't know where you got 573k from.

[@rsts32]

He just converted from Celsius to Kelvin :D

[@jeffbirt6671]

Sorry for the confusion. I mistakenly used k when I should have used R, the gas constant, which is the Boltzman constant multiplied by Avogadro's number. I do use the gas constant when I first introduce the formula at 2:34. Raniel is right about the Kelvins. Thanks!

[@Arthanzar]

In the equation for D at ~ 2:22, you didn't define "e" or "pre-exponential." Please define these.

[@shubhamkumaryadav3531]

sir, voice is low, i cant hear

[@EngineeringandDesignSolutions]

You might check your hardware or software. No one else has had this problem.

[@eanrobertson3689]

@@EngineeringandDesignSolutions Everyone else does have this problem

[@patrickdouglas5459]

I think you got some work to do with the sound