Osmosis Demo

Mr. Andersen gives a brief description of osmosis. He explains how water moves from a hypotonic to a hypertonic solution across a semipermeable membrane. The video ends with a time-lapse demon in class.
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Artist: CosmicD
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[@rowan6743]

a u tube... on you tube.

[@chickenfarmer321]

Indeed.

[@emojisrule8048]

I was about to say that 😑

[@Alkimachos]

@@emojisrule8048 same -_-

[@themeowhogsmeowkitten4178]

True

[@Borno1]

Even after 11 years, it was so helpful

[@kingronnie7002]

Great vid you helped me out a lot. My teacher doesn't know what she's talking about.

[@drdough7982]

king ronnie EY ME TOO

[@kea052189]

😂😂😂

[@sophiaallie127]

Oml lol same

[@katkitkat702]

I learn science better when I watch it. I always look for Mr. Anderson because after I watch his videos I actually "get it". Thank You Mr. Anderson!

[@katkitkat702]

*****​ i commented that like last year you creepy troll

[@jasmineeubanks8301]

bozeman science stopped me from cutting

[@pena1979able]

OMG finally understand!! Now I need to understand filtration.

[@stefanyrigbor9606]

goodin iris

[@aayushbhardwaj6735]

Sir what If we use pure water on one side, will this type of osmosis end ?,(as no isotonic solution will be achieved )?? //In ideal case

[@xaz2117]

Who is here for Mr.rehman

[@gamepoint9252]

But why it flow upwards

[@eduardosoccer7]

Thank you Professor Andersen this video was really helpful. I was struggling to understand the Osmosis process, i was confused because in the book its said that the water diffuses across a membrane from region of lower solute concentration to a region of higher solute concentration. and in some videos they showed osmosis going from high to low concentration. But now i understand what they meant thanks to you.

[@superdog797]

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.

A great video! Well done! Me encanta tu trabajo. Gracias!

[@sweetness583]

That seems crazy. I thought gravity would force the liquid to remain even on both sides. I guess my question is how is it able to overcome gravity?

[@patientno1797]

did you not watch the video?

[@superdog797]

I wrote a comment about this. You can read about it if you want. I think it has to do with momentum.

[@cryora]

That's cool. I was skeptical about osmosis when reading about the u tube example, but this experiment proves it. I still have a hard time wrapping my head around the concept that mere random motion of water will cause it to diffuse like this even against the force of gravity. Does this mean that the polar solutes create a net attractive electric force for polar water molecules? I reckon the answer is no. What if the substance was was hydrophobic, thus does not dissolve in water. Will we still have some form of diffusiin effect even if only a little?

[@topem97]

Thank you Mr. Anderson! This helped me better understand the subject for my exam tomorrow!

[@ingridrodrigues1232]

Very interesting

[@plopple1]

Guys I’m so confused! Could some please tell me why the corn syrup is going against gravity!?!? (def not for class)

[@shaikhmaeidah]

Good vedio... it mkes us understand d concept well

[@billzen]

All OK but osmotic pressure has nothing to do with water molecules interacting with the solute- it is a colligative property.

[@patrickconnolly9807]

Mr. Anderson helped me get an A on my test! You're the best! Thank you, Mr. Anderson!

[@ScienceGeek23]

this video was fantastic and helpful and my students loved it. We actually did the same thing, but with an egg, whose shell was dissolved with vinegar :)

[@mariaabdelsayed1424]

Will the solution inside the tubing ever be isotonic with the solution outside of the tubing?

[@shellyoung2646]

Bent tube model, shown in this video, shows osmosis better then a glass devided by a membrane.

[@palamagoose4572]

So what I'm hearing is... perpetual motion

[@shaesturme8203]

thank you so much!! Osmosis has FINALLY clicked in my mind. :)

[@pmfinverr335]

So much nutrients go in corn syrup right ? If I understand it is not wrong

[@raygaytan1836]

Awesome!!!!!! thank You!

[@Infernal3661]

Mr. Anderson...

[@kilarosul]

When we speak about osmosis we must know a little about the hidrogen bonds of the water so we can understand the procces much better. So my question is dose the capilary action of water has to do something with the osmosis in a u tube? I know both phenomenons happenes because of the H bonds of the water? Im studying for the IMAT so if u can make a vid about the IMAT test and what is ur opinion about it? Thanx!

[@melissarainchild]

Finally. ANd now I get it why a bloodcell shrinks in a hypertonic environment. And...no environment is just hypertonic, it has to be hypertonic in relation to something else...Thanks for explaining...Two minutes versus two hours...

[@durotan1399]

Another word. Osmosis: Is the diffusion of molecules from the least concentration (Hypotonic ) to the most concentration ( Hypertonic ), is thats right ^_^

[@kairo7k]

why is the bag filling up against gravity

[@itsReallyLou]

My summary: Due to thermal motion, water molecules are continuously moving back and forth across the membrane. The low solute side starts out with more 'available' water molecules, resulting in a net flow rate toward the high solute side. As the process continues, the increasingly unequal heights of the two columns produces an increasing counter diffusion force, due to higher gravity-induced fluid pressure on the high solute side, resulting in the equilibrium state, with a higher fluid level on the high solute side.

[@Medi-Nor]

Very clear explanation , very helpful 👍🏼👍🏼👍🏼👍🏼👍🏼👍🏼👍🏼

[@TheOneMusketeer]

I am in 6th grade and my teacher tried to explain this to me because I was struggling. I watched your other video on diffusion and Osmsis but this helped me understand it better.

[@anonymous-zq2jf]

thank you so much sir, I was literally so confused related to this topic and you just cleared it under 4 and a half mins. big big big thanks.

[@nathanpowers7615]

"The video ends with a time-lapse demon in class." Dang this science class is lit. In all seriousness though, I've come across this concept multiple times in my classes now but it still seems counter to logic that the mass of the water doesn't counter the... osmotic force I guess? I still don't understand exactly what force or process is causing the water to defy gravity. Maybe it's the same concept as the hydrophobic effect/ water lattice entropy efficiency thing that I forget the name of?

[@CoDRagna]

AMAZING!

[@ڤیدیۆکانیپۆلی12]

Thank you very much professor so so benefits

[@ForeignMoves]

Didn't need this information for anything at all, but still a great video.

[@tamerasmartt4721]

If we had mgcl on one side and glucose on the other side of equal concentration to the mgcl. Which side will increase?

[@bynphw]

bozeman science comming in with the clutch when you need an answer in bio

[@DevilgodG]

In case you want to correct your description: I think you meant "demo" and not "demon"

[@eastcoastsunset1]

THANK GOD AND JAMES EARLE FOR TELLING ME ABOUT THESE VIDEOS! I would be literally failing without them

[@chickenfarmer321]

On the cell membrane video, I thought you said "KZbin." Ohhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh.......

[@SteveCA1972]

👍

[@emmaemma7575]

I love this topic ❤

[@lily2341]

thank you so much! so helpful for my test tomorrow!!!!

[@Anniekaaria23]

All time brilliant Professor. Always very clear. Thanks.

[@moratheexplora3087]

Love all your videos. Very helpful. I hope I can teach as well as you one day.

[@keyspark]

yet another sick video from mr. andersen

[@АньЛыу]

I have a question, Is P1b equal P2b

[@kxmz3113]

Ánh Lưu no

[@123DOWNUNDER890]

thanks! this helped so much, I was struggling..

[@KalyanChatterjea]

So well explained and so fantastic demonstration. Just waht I need for my class! Don't know how to thank you!!

[@OverLordSky]

What's a time-lapse demon?

[@Missmama1475]

your videos really help me study for my bio lab exam. Thanks:)

[@matthewpapageorge1675]

Thanks, this helped clarify osmosis for me.

[@SlushGuppy]

Lol, U-tube...

[@xRosie7x]

Very helpful video, thank you! ^^

[@CariBaez]

ok

[@Arieta4hearts]

thnk you

[@klutchplaya]

Professor Anderson you have the best science videos! Thanks!

[@sypop23]

you let kids text in class?

[@classicmercs1689]

lol utube :)

[@therevengist15townsend97]

hey im in shreck class say hi

[@chrystallay2516]

Very helpful!!! Thank you!!

[@nightcoretoxicality6222]

KZbin or UTube XD 0:29

[@MicNarcolepsy]

Wheres the music from?

[@syasha4ev3r]

that's a rly good one !

[@emilieclimer4344]

Where do you teach?

[@chibi137]

thanks to this. 👍

[@maxdream5457]

YOU ARE THE MAN

[@JoseVazquez-iz6oo]

so helpful

[@Alochan]

Does anyone have the answers, Pequea Valley High School.

[@Alochan]

Normies

[@kxmz3113]

Alochan lol

[@BMWRacing9]

Comment.

[@murryadams7]

neat demo

[@katerina93boom]

cool! ((:

[@eliwasserman3053]

i love science!

[@GoCubsGo2012]

Utube

[@AJComerate]

BozeMan Science is the real daddy.

[@jasmineeubanks8301]

+EnderDGames "hot"

[@AJComerate]

+Jasmine Eubanks one time I caught bozeman science having sex with my mom and then he ran off.

[@jasmineeubanks8301]

+EnderDGames Is that what's wrong with you

[@yeana94123]

Goood

[@kjing8109]

why dont the charged particles move through protein channels instead?

[@quackoqazs]

There are no protein channels on dialysis tubing

[@kjing8109]

I was talking about a cell

[@hustlehardstudyharder8197]

jordan king They do it's called "Ion channels". But sometimes the cell wants to move them against their gradient which requires energy (pump).

[@kjing8109]

HustleHardStudyHarder I know that. I was referring to the fact that water is the exception to the rule. The membrane doesn't usually allow charged or polar substances to diffuse through it, however water can

[@kjing8109]

HustleHardStudyHarder I know that. I was referring to the fact that water is the exception to the rule. The membrane doesn't usually allow charged or polar substances to diffuse through it, however water can

[@ogablue2728]

wow this is so bad. I will never get back that 4:27. I want to die

[@spf5215]

Brilliant. I had to refresh up on Osmosis and was really struggling to find an excellent explanation and demonstration. Thank you Mr Anderson for this wonderful clear video - with demonstration (if a picture speaks a thousand words, then how many does a video??) and for having passion in teaching the wonderful subject science.

[@yinze0089]

Very helpful thanks! Also, you're cute too!

[@callanhainline4063]

Zoom in at the molecular level amirite?!

[@kyleg4453]

Jesus loves you!