Learn and observe the concepts of diffusion and osmosis in the context of cell biology.
Пікірлер: 212
@TobyOnTube10 ай бұрын
I would like to be tested / criticised on the following comment: in the beginning when demonstrating diffusion I do not think the experimentor demonstrated diffusion. I think she demonstrated brownian motion. And possibly not even that. The hot glas is in a thermal inequilibrium: the glas, the water, the room do not have the same temperature. The surface or top part of the hot water is cooler compared to the bottom part. Therefore it is likely that you have a circular convection current transporting energy from bottom to the top part. However, no circular current is seen. Thus the change in solute concentration is likely due to a combination between brownian and convection motion. A better experimental setup would be to have a heated chamber (can be acquired and biologist use it relatively often in their labequipment). In that setting, everything (water, glas, and room and also the solute substance) is in thermal equilibrium thus ruling out convection. My intuition tells me that transport via convection is much larger than brownian motion. Please comment on all this.
@sciencenorth10 ай бұрын
Hi @TobyOnTube, We appreciate your scientific curiosity! At the beginning of the video, we explained that diffusion is the movement of molecules from a high concentration to a low concentration. The purpose of the demonstration with the food colouring and the water at different temperatures is to show that the food colouring spread out more quickly in the warmer water than it did in the colder water. This was to explain that diffusion happens more quickly in warmer fluids. In the terms you are describing, we oversimplified in using the word diffusion having not considered convection or Brownian motion. Convection does explain the movement of the molecules in the fluid but it wasn’t the focus of the video. There may be other experimental setups that better demonstrate diffusion but again, that wasn’t our goal with the food colouring. The actual demonstration of diffusion was shown with the following two demonstrations to show diffusion through a semipermeable membrane using the dialysis tubing. Thank you for your question. We encourage you to go forth and carry out your own experimental methods to test your hypotheses!
@reaper78843 жыл бұрын
Got here from online class, btw who's here in 2020
@jessicas93153 жыл бұрын
me :]
@kavinelango38883 жыл бұрын
@Angel Fires same
@sumithhebbar3 жыл бұрын
Ayyyy
@anumwarsi9373 жыл бұрын
Same got here from online class
@XSypherX3 жыл бұрын
same here
@francescar80175 жыл бұрын
Hehe im a student watching a vid for teachers
@juibi80064 жыл бұрын
savage
@noahlong31954 жыл бұрын
Same 🥱🥱
@salomek76064 жыл бұрын
My teacher told me to watch this
@Simplydarrell3 жыл бұрын
Know your role!!! Jk
@greatestwerstlingedge97593 жыл бұрын
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@grummy37703 жыл бұрын
I’m on a zoom call while watching this for school lol
@ariesdelosreyes92753 жыл бұрын
Hello, we are using this as a reference for our online Bio Lab. Thank you!
@technocratenitin99374 жыл бұрын
Do you know ...that was awesome .for so many years a was perplexing In osmosis and diffusion .but today it is crystel clear .. Thanks a lot .God bless you..
@nicebassbro67533 жыл бұрын
Crystel
@plvto14364 жыл бұрын
Online school brought me here
@robloxmain13684 жыл бұрын
same mad unlucky
@harveyjamesadams89874 жыл бұрын
plvto oh me too
@kezzathebesta31763 жыл бұрын
welp and here we are as well, online school man.
@zainabhussain53433 жыл бұрын
me 2
@simir81653 жыл бұрын
Me too
@kyuubinoyoko014 жыл бұрын
Lymphedema certification brought me here. Thanks for the refresher!
@wilfredapetorgbe86092 жыл бұрын
wow really helpful thanks a lot looking forward to your next video
@hannahbermeollanos1553 жыл бұрын
I understood all your explanation, is the best.
@princekaonga33733 жыл бұрын
As a student teacher at Chalimbana University, I find this video more useful on the related subject; Diffusion and Osmosis
@simonforster4776 Жыл бұрын
A very good explanation - thanks
@shreenidhi36832 жыл бұрын
We enjoyed this video a lot. Thankyou !
@hilarioalejo23487 жыл бұрын
The best explanation, thanks for sharing your knowledge and your comprehension.
@rimamariya1774 жыл бұрын
Your explanation is really helpful 👍👍
@simir81653 жыл бұрын
Thanks for this video,it was very helpful
@noorsaif83463 жыл бұрын
So Ur saying that if I fart somewhere where it is hot it will spread places further? OMG this is perfect!
@itzsafah-um4pf Жыл бұрын
Did anyone notice that she added 2 drops of red food colouring into the beaker of hot water and only 1 drop of blue food colouring into the beaker of cold water? And I wanna know if the amount of drops added matters
@TobyOnTube10 ай бұрын
The Best way to go around this is to do diffusion experiments yourself. At least that is my plan. Demonstrating diffusion is not easy. The mean distance of a solute particle (food color) in a solvent (water) increases with the sqrt of time. This is one of the major results in Einstein's 1905 paper. This means that in the beginning things evolve (diffuse) rapidly but then slows down for larger and larger time periods. A complete mixing of the solute in the solvent could take days.
@SNEHA1999. Жыл бұрын
🤗very well explained ☺️
@ramadhanmajeedmogga42392 ай бұрын
Thanks I appreciate for your help 🙏
@ackylahbyron53562 жыл бұрын
I'm a student and this vid helped alot
@SemaAkca-fl5xh Жыл бұрын
awesome, thank you for sharing this video
@xx_Rising_Thunder_xx9 ай бұрын
I’m in class and me and my friend started laughing while reading these comments instead of doing our work 😂😂
@AshKetchum093 жыл бұрын
I’m watching this so I can make a flip book animation for science. Best teacher ever.
@anisurrahman66334 жыл бұрын
Please, show the experiment from a closer camera. Than it will be effective.
@misterlawlor Жыл бұрын
Great video. I particularly enjoyed it in 2x speed.
@abdulhafeez18283 жыл бұрын
This is one of the peoductive vedios that i ever seen..keep making and spreading the knowldge
@abhinandanmehta9154 жыл бұрын
Thanks for this vid,helped me a lot..
@anujarora06 жыл бұрын
Keep doing that was a great fun with good knowledge
@yossefrefaey5 жыл бұрын
Helped me alot with my study thank you
@sciencenorth5 жыл бұрын
That is so great to hear, thanks for sharing, Mr. Refaeizz! :)
@xtgamesv.26734 жыл бұрын
this really helped thank you!
@georgetteemary94203 жыл бұрын
Now I understand well thank u
@ssana20004 жыл бұрын
Dr.S.S.Ahmed, from Hyderabad, India I really appreciate your efforts you made for this video..Its awsome. Will you please let me know the preperation on Semi Permeable Membrane too........
@nanak33634 жыл бұрын
It's available on amazon
@thedreamofplanrotherangerg82714 жыл бұрын
It can be easily define by this type of example
@superdog7974 жыл бұрын
OK I think I figured out a mechanism for osmosis. Sal's explanation is kind of correct but doesn't quite express it right. The gist of it is that there is a net momentum vector for all the matter in the system that sits on the solute-solvent mixture side of the membrane. If you break the system down into two masses, the mass of water, and the mass of solute, we see that the mass of water's (solvent's) center of momentum movement is directly in the middle of the system over the membrane. However, when we look at the mass of solute's center of momentum, we see that it's in the middle of only the solute-solvent side. When you take the average of these two momentum vectors you get a net momentum vector that has a center somewhere between the two in physical space, so the tendency overall is for the water to move in the direction of the solute-solvent side toward the center of mass of the system. Another way to think of it is that the barrier imparts energy to the system only on the side in which it is capable of deflecting matter (solute side). The Brownian motion of the molecules is the driving energy of the movement of molecules in the system. Where does the energy come from from the Brownian motion? Well, perhaps there is some internal energy at the subatomic/nuclear level, but I suspect it's more driven by the addition of heat from the environment and the transfer of kinetic energy to the particles from the barrier and walls. If a molecule hits the membrane, it is accelerated in the opposite direction. Energy is imparted to the molecule from the wall, and the wall gains energy from the particle. With each exchange, some kinetic energy is lost due to friction. Because the membrane is, on net, only interacting with the solute particles, any kinetic energy that the solute particles lose to the membrane barrier is lost only in that side of the system, but not the other half. This would imply the overall kinetic energy of the solute-solvent system is less than the pure-solvent side, which would obviously lower the water pressure and thus move water, on net, into the solute-solvent mixture side. But, you might ask, osmosis is powerful enough, apparently, to work against gravity. This requires work, so energy LOSS doesn't seem to really explain how it can do work. Well, like I said, the Brownian motion of the particles is constant overall, so whatever inputs to the Brownian motion of the particles are, it must be the energy into these inputs that osmotic energy is driven by. It must be the case that the heat of the environment is going into one side of the system at a higher right than the other. I suppose that the solution must have the same temperature throughout on both sides of the membrane (does it? I suppose this could be measured). The order of energy seems to be: heat from environment --> Brownian motion of liquid particles (Kinetic Energy) --> energy lost to membrane barrier The energy lost to the barrier must be small compared to the increased input from the environment, otherwise you wouldn't be able to do work like elevate the solution against gravity. I would therefore speculate that the rate of heat intake in the system is greater on the solute-solvent side, because for the Brownian motion to remain constant, one needs an increased amount of energy to compensate for the energy lost at the membrane. So that's my hypothesis about osmotic mechanism. Any thoughts? The next question I have is: if this description is correct, does it imply that the total osmotic pressure is linked (proportional to) to the surface area of the membrane, or that the surface area of the membrane merely affects the rate of osmosis overall? Intuition at first tells me that the increased surface area of a membrane should increase the osmotic pressure overall, however as far as I know, the osmotic pressure is directly proportional to the solute concentration only, not the membrane surface area. This may imply that the surface area of the membrane only affects the rate of exchange, but not the overall osmotic pressure. This could be tested empirically by simply having two separate identical systems in terms of water mass, solute concentration on one side, and varying only the surface area of the membrane, and then measuring (1) what the rate of water movement is, and (2) what the overall end result is at equilibrium. If the rate varies but the end result is the same, then the membrane surface area doesn't affect the osmotic pressure. If the end result varies, then the osmotic pressure is proportional to the surface area of the membrane. As a secondary experiment, you could measure the temperature of the fluids and the rate of heat exchange on both sides of the membrane.
@pateldivy64645 жыл бұрын
Great contribution to teachers thanx...👍👍
@nancyboakye81292 жыл бұрын
I am a student I really love this video the best explanation thanks for sharing this video it has helped me clearly to understand osmosis and diffusion thanks
@nancyboakye81292 жыл бұрын
❤️
@NotSoFunnyAnimator3 жыл бұрын
Dang, I can't watch this, it says it's for teachers.
@alsaineybarry25984 жыл бұрын
So great we are really learning
@courageofhumanity20062 жыл бұрын
Thank you very much make for such video.
@atraaqilian1727 ай бұрын
This teached better than my science teacher
@ArticPup-Gacha3 жыл бұрын
Using this video for school, Tysm this helped me a lot and it was easy to understand
@carleli71625 жыл бұрын
Great explanations!!! Good job!!!
@simiyusegunoluwaseun17315 жыл бұрын
that's a great explanation.keep doing well!!!!. thanks
@sciencenorth5 жыл бұрын
Thanks for watching and for letting us know, Simiyu! :)
@prassaadbehara41526 жыл бұрын
Good Job.
@rajatrodney2592 ай бұрын
Is the second experiment (Starch and Iodine) an example of diffusion or osmosis?
@loganmosling33142 жыл бұрын
When you are a student watching a video for teachers >:)
@KirssisPeguero6 жыл бұрын
Excellent job!
@nickcheng79394 жыл бұрын
thanks. you saved my life. you have a sweet voice and a beautiful face
@whatdoyouknow48434 жыл бұрын
The video is good. The one comment I will make is that the instructor could talk slower to allow people to follow better.
@totaahmad19813 жыл бұрын
Think you كلشششش هوايههه
@archivaljrvelasco2373 жыл бұрын
is there a script for this or manual?
@ChocolateMan142 Жыл бұрын
As a 12th grade student, thank you
@dah-bu1fi Жыл бұрын
I love ❤ this video or experiment
@jonni27344 жыл бұрын
Really interesting!!
@masumbillah31244 жыл бұрын
Excellent
@studying5483 жыл бұрын
best superb BINOD
@stephanieoyebamiji48546 жыл бұрын
thank you
@mayuraa95173 жыл бұрын
Tq this helped me in my science exhibition ❤️
@colletteikeanyibe14873 жыл бұрын
Is osmosis from a region of high concentration to region of low concentration
@olaydeodea90062 жыл бұрын
طالبة سادس اعدادي مرت من هنا😊 15_10_2021
@xjxbxnddnfnrajaj89615 жыл бұрын
Nice
@Daily.Fun_Facts-1z Жыл бұрын
Qais Ebbini JOD 500.000 Thanks
@sfyzie_ice5 жыл бұрын
nice experiment ;)
@haripriyabala50173 жыл бұрын
Thank mam for is demonstration it is use full for my studies
@kumkumslab58114 жыл бұрын
Nice mam
@shanthala13452 жыл бұрын
Thanku 🥺🥺
@emmanuellaopokuabrafi4673 Жыл бұрын
Thank you 😌
@amrita7703 жыл бұрын
U said it very well but focus the camera front
@user-nf2tm2gh3y3 ай бұрын
I like it this video ❤❤
@thomasanderson14164 жыл бұрын
Are you Canadian?
@vasundhara20243 жыл бұрын
I am a student....I really loved this video...it explains a lot☺️😊
@muskanali12362 жыл бұрын
I am in 9th class from kashmir and that was my question why osmosis takes place through a semipermeable membra ne and i was thinking like what about diffusion now it's clear that diffusion occurs into a semipermeable membra ne.
@user-ji9ln7ni1p3 жыл бұрын
Thanks you💙
@peising41894 жыл бұрын
what if you swap the sucrose with glucose solution? Glucose will diffuse out of the tubing while water molecules will just diffuses into the tubing until an equilibrium is reached , and so no change in the level of the solution in tubing and beaker, is that right?
@giftofeducation3006 жыл бұрын
Mind blowing explanation.
@akuaamo5973 Жыл бұрын
Great
@studyland47793 жыл бұрын
Is this for a student of class 6th
@restyseptiayu26583 жыл бұрын
nice video
@mingeuncho58773 жыл бұрын
정말 잘 했습매다
@TobyOnTube10 ай бұрын
Well, it does not demonstrate diffusion. It demonstrates convection.
@mingeuncho58773 жыл бұрын
Very well
@naseffsambuto84123 жыл бұрын
new subscriber here.....I mean new supporter keep it up!!It really helps me a lot thanks for explaining it fluently. [][][][][][][][]