Fick's First Law of Diffusion

A simple explanation of Fick's First Law of Diffusion.

[@frankfei9130]

You did a much better job than the textbook I am reading on explaining what flux and fick's first law really means. I really appreciate the part that you showed how to derive the unit of J. That is so helpful. Keep up the great work, looking forward to seeing more fantastic teaching videos from you. Billion thanks.

[@bosicsbenom8788]

I was almost crashed by my assignment, but thanks to you I understand the law very well. 😁guess I am ready to teach others

[@neenoo12345]

Such a great video, you made the concept very clear and easy, instead of other science-y vids where I pause every 5 seconds trying to process what just happened!

[@AndreiGavrea]

Thank you very much for the video! I think nobody else explained what the negative sign of the diffusion coefficient actually stands for.

[@aismoyoy6745]

a huge " thank you " from Algeria .wonderfully explained

[@EngineerClearly]

Thank you and you're completely right - I was just hinting at the calculus and should have directly stated it. When I remake this I'll make sure to add that in.

[@IslamNegm]

I think it's better to think of D (diffusion factor) as it's (mean length * the avg velocity of particle) >> D = l*c , because D = A/t is not making any sense. because if we developed this term in microscopic terms in 3-dimensions , D will be = (1/3) (mean length * the avg velocity of particle in the direction of l ) correct me if I am wrong, please :) Another small comment on the video: You've typed D = Area/s

[@RoniPhD]

+Islam Negm It is a good way to think about it. Since Fick´s equation is a constitutive relation, in continuum mechanics you will have a second order tensor to represent this ability of A to diffuse into B, and due to randomness of the microscopic phenomena I would speculate and say it should be isotropic like Newton´s viscous stress in fluid mechanics. Then the vector Ji should be the result from the inner product between Dij and CA,j where CA is the concentration of A scalar field and comma convention is used for the derivative in the j-th direction

[@jonny2575]

I like math cause I can say: AttentionWhore = Area/time. As long as it's explicitly defined, I can always tailor it to my understanding. Mean and average it... do it big baby. I'll stick with the general idea for now though. Anyway great critique ^_^, thanks a lot.

[@madeinfrance06]

great video thanks , keep it clear and straight to the point like u did ... i would only add a quick common example of question and resolve it real quick ( with easy numbers just to understand how u make it work )

[@1997vergil]

Great work, thank you for the really useful lecture. Respect

[@sabirina498]

HI from 2020 😂...I want to say thank you so much...it was really a good explanation...Thanks from Algeria

[@juanramonavendano2845]

Thank you for a clear and direct explanation. Could you tell me what is the software to do presentations like this one ? I found it very dynamic and useful . Fantastic combination of visual elements and dynamic development of the theory !

[@msrasras]

Great job sir, you infused Fick's first law with life.

[@meiling6177]

thanks for your nice explanation. how is the second law?

[@adindatisha9567]

Thank you. This video helps me so much

[@Jebuschic101]

Thanks for the video. How would one calculate the concentration of A at point 2? Knowing the diffusion coefficient and the distance from z1 to z2, I can't figure it out. Was trying to figure out the flux, but I need C2 to do that!

[@anatolbeck1992]

Wow what a fantastic explanation!

[@shengyuanyi]

That is awesome. I was always wondering why Fick's Law study flux instead of flow rate. Then I understand it. Thanks

[@foreverblink2601]

Thank you! You really made it easier!

[@rubanakakodker8914]

Thank you for a wonderful explanation..

[@auwylim]

thank you , you are much much much much better than my shitty professor

[@egiphermutintamanengu2464]

dont ever call your professor shitty no matter how shitty they are.

[@IceyJunior]

called it here is fine

[@celinematar9201]

hello, very good explanation, can you tell us on which software did you make this video ? thank you

[@miko1516]

Thanks, but how to apply Fick's law if we just have the concentration / Absorbance?

[@YounesYousafi]

very well explained, thanks for sharing

[@vignesh8507]

super explanation ..... thank u sir

[@IvCastilla]

Good explanation Thank you

[@mustafa3511]

perfect video thanks

[@djkdenny]

Very well explained. Thank you.

[@josenintendo1]

how come books don't explain it as well, after i watched ur video i was able to understand it way better, thanks

[@devwatch6305]

Thank You so much You help me a lot

[@A2Kaid]

J= -D (∆C/∆X) Flick's Diffusion equation. J = Flux, -D = Diffusion coefficient, ∆C = Concentration Gradient, and ∆X = Distance.

[@Bluebomberman]

Thanks i really appreciate your work

[@galvintang6746]

Why is Z the area? If it is the area, and C has a unit of particles per volume, and D has a unit of area over time, then Flux will have a unit of (number of particles)/(volume*time) right? So if Z is the distance, then it makes more sense. Is it correct?

[@ben5234]

Hey nice video helped me a lot, but i would maybe explain further that the d's dont simply change to delta because they are small, but they are from integrating the equation with limits. Anyway, thank you :)

[@samgonzalez7302]

mad sick bro.

[@zunaidazakaria8606]

Really interesting and thank you for the explanation :D

[@SharpSniper10]

Who is here from the lovely Dr. Iyer?

[@ak3962]

fatttassss G

[@EngineerClearly]

Dr. Iyer?

[@baudeagle1]

Is Darcy's flow equation related to Fick's laws? Looking at Darcy's flow this seems to be applicable to liquids but the it also seems similar to Fick's equations.

[@jhanolaer8286]

Hi sir,how to solve/find the vector of this diffusion?

[@huwjonesification]

Thank you so much! I was so stuck on this for ages. Fick's law is used in the reactor physics, and all the explanations are so rubbish!

[@lordfarquaad9887]

thank you so much

[@jasonwoo6687]

i hope you can speak slowly,or add subtile.cuz im not good at english.anyway,i think this video is helpfu.thank u

[@EngineerClearly]

I had to Google Merci pour l'explication Thanks you! :)

[@Dr.FlyDog]

yes, it is great !

[@hsoley]

Nice!

[@anatolbeck1992]

yes i study physics in vienna and im about to derive the thermodynamic formula and the fluid dynamics but i had some problems to follow fick's derivation. I searched for an explanation on the internet and the first "usable" video was yours! Very nice work...but the circumstance depending D which is : Mean free path*mean velocity/3 can't be reconstructed by your idea...i tried it...maybe you can text me how you got the D...thanks and merry christmas!

[@CharlesJonesPharmD]

Where does partition coefficient come into play?

[@EngineerClearly]

@anatolbeck1992 Really? Thank you - I appreciate that.

[@EngineerClearly]

Thank you and I really don't know.

[@futbolscoop]

Thanks

[@kgjkhfghvjkggjdf7318]

C'est une belle video mais je ne compris pas la langue bien parce que en Algérie on étudier la langue française😢😢😢

[@veteranrider6020]

good job

[@TheSrb1992]

thank u very much

[@Climstork]

Merci pour l'explication :) Can you explain the second Fick's law please ? I'm lost :)

[@StephenRayner]

THANK YOU SO MUCH!!!!!

[@saraherself98]

Thank you very much sure :)

[@arpit66]

thank u........

[@diodiof2959]

thnx

[@Sophia-ui6xo]

what "C" and the "hashtag" express PLEASE ??

[@Sophia-ui6xo]

Represent*

[@تقىكمال-ص7ط]

perfect

[@GuptaPeruri]

but the flux J is not with respect to stationery coordinates!!

[@bryanpiguave9445]

Can you elaborate?

[@SuperTf2rocks]

DAB!!!

[@kittycat1768]

Grade 10 Biology why you gotta be so hard

[@Tyandaga]

So dry xD , good try though ^.^