Osmosis as you have never seen it

[d-o-n-u-t]

"There are no magical forces sucking the balls"
- Physics Videos by Eugene Khutoryansky

[alejandraserrano]

I’m genuinely glad that I’ve been a subscriber for quite a while now. I feel grateful towards you for making physics and mathematics my greatest goal and the center of my life, as I thank you for your constancy and dedication. We all appreciate you a lot around here. Always on point; keep it up!

[IncroyablesExperiences]

The content on this channel is always excellent but what I love the most is the music and the voice 😂

[anonymous.youtuber]

This is how osmosis really works. I remember teachers mentioning a mysterious sucking force. Thanks for elucidating !

[alachance]

This helped my intuition a ton.
So hypothetically if the membrane only let the squares through, we'd see the same thing but to the other side.
Amazing.

[okloster]

As noted in the commentary, there are no attractive forces between the particles in this simulation. This means that you are simulating two ideal gases (well, if we ignore the particles' volume). In such a case, the osmotic pressure is equal to the partial pressure of the cubes, while the partial pressure of the spheres will converge to being equal on both sides of the barrier.
The simulation is not representative for osmosis in liquids. For liquids, there IS an attractive force between particles, and this is essential for explaining the high osmotic pressures in liquids. For instance, the osmotic pressure between sea water and fresh water is an amazing 24 atmospheres, although the difference in salt concentration is only 3.5%.

[NXaiUL]

Thank you so much. You have the best intuition on physics, classical or otherwise.

[Wurmish]

I imagine most sorts of semi-permeable membrane can be abstracted to this kind of visualization? The purpose is to show that a shape-specific filter has that result whether they are simulated shapes or biology, chemistry, and physics doing their things, correct?

[tomasprior]

You never cease to amaze me! Amazing work as usual.

[vauchomarx]

"This is the beauty of physics" - You just described your channel in a nutshell!

[anteeko]

Such a fantastic channel, I cannot even explain how glad I am to have found this place, thousand thanks!

[insideoli]

So happy you are back!! ❤️ always supporting this channel since forever ago!!

[Manabender]

Hey, I just wanna say: Your videos are amazing. They have incredibly insightful and intuitive demonstrations of otherwise hard-to-understand concepts.

I get the feeling they're primarily intended for use in schools. But honestly, I enjoy them for their own sake. Keep it up; you're doing great work.

[Rhannmah]

This is indeed the beauty of physics. Extremely simple laws, profound consequences beyond measure.

[vash-san]

I like the heavy metal backing track! The explanation is also very clear, thank you!

[jaxnean]

These particles sure have a broad taste in music!

[kanabhprates]

Oh god, so awesome channel. Thank you for your work.

[maxwellsequation]

Yay! My fav youtuber uploaded!! Brilliant video and explanation, as always :)

[marklundeberg]

Great demo! Another interesting case I can imagine is where there are some attractive interactions between the cubes(so it becomes a liquid), but keeping only the same hard repulsion with the spheres. You can then demo some things like colligative properties, and also show that the 'vapor' of spheres above the liquid has equal concentration on left and right, at heights where there are few cubes. I've always wondered if there is a clean and intuitive way to visualize chemical potential, and perhaps this approach could help.

[omraikar]

Thanks for this video 🙏. It's one of the best in your playlists.
I think I finally understood osmotic pressure.
Please correct me if I'm wrong.
So, initially we have water(spheres) on both sides and the pressure on both sides of the wall is equal. Suppose, we add NaCl salt and the ions get hydrated immediately and represent the cubes. The cubes owing to their larger size, restrict movement of spheres and even block them from effectively colliding with the barrier. This can be thought of as decrease in the pressure on that side. So, now the other side spheres will cross the barrier more frequently until pressures are balanced again. So, there are more net molecules on the salt side and denotes the increase in height. This decrease in pressure on the salt side is called osmotic pressure and proportional to the concentration of salt added.