Share Tweet Ven diagram of osmosis vs diffusion.
Passive transport Video transcript In this video, I want to cover several topics that are all related. And on some level, they're really simple, but on a whole other level, they tend to confuse people a lot. So hopefully we can make some headway.
So a good place to start-- let's just imagine that I have some type of container here. Let's say that's my container and inside of Science diffusion and osmosis container, I have a bunch of water molecules. It's just got a bunch of water molecules.
They're all rubbing against each other. It's in its liquid form, this is liquid water. Maybe I'll do sugar in this pink color.
So I have a bunch of sugar molecules right here. I have many, many more water molecules though. I want to make that clear. Now in this type of situation, we call the thing that there's more of, the solvent. So in this case, there's more water molecules and you can literally just view more as the number of molecules.
I'm not going to go into a whole discussion of moles and all of that because you may or may not have been exposed to that yet, but just imagine whatever there's more of, that's what we're going to call the solvent.
So in this case, water is the solvent. And whatever there is less of-- in this case, that is the sugar-- that is considered the solute. It doesn't have to be sugar. It can be any molecule that there's less of, in the water, in this case.
And we say that the sugar has been dissolved into the water. And this whole thing right here, the combination of the water and the sugar molecules, we call a solution.
We call this whole thing a solution. And a solution has the solvent and the solute. The solvent is water. That's the thing doing the dissolving and the thing that is dissolved is the sugar.
Now all of this may or may not be review for you, but I'm doing it for a reason-- because I want to talk about the idea of a diffusion. And the idea is actually pretty straightforward. If I have, let's say, the same container. Let me do it in a slightly different container here, just to talk about diffusion.
We'll go back to water and sugar-- especially back to water. Let's say we have a container here and let's say it just has a bunch of-- let's say it just has some air particles in it.
It could be anything-- oxygen or carbon dioxide.For an organism to function, substances must move into and out of cells. Three processes contribute to this movement - diffusion, osmosis and active transport.
The processes of diffusion and osmosis account for much of the passive movement of molecules at the cellular level. In this laboratory, you will study some of the basic principles of molecular movement in solution and perform a series of activities to investigate these processes.
Science, Tech, Math › Science What Is the Difference Between Osmosis and Diffusion? Share Flipboard Email Print You can use gummy candy to demonstrate how osmosis works. Water travels from an area of high water density through the gelatin to an area of low water density, swelling the candy.
Martin Leigh, Getty Images. Osmosis: Osmosis, the spontaneous passage or diffusion of water or other solvents through a semipermeable membrane (one that blocks the passage of dissolved substances—i.e., solutes). The process, important in biology, was first thoroughly studied in by a German plant physiologist, Wilhelm Pfeffer.
Osmosis and diffusion are related processes that display similarities: Both osmosis and diffusion equalize the concentration of two solutions. Both diffusion and osmosis are passive transport processes, which means they do not require any input of extra energy to occur.
Diffusion and osmosis are both passive transport processes, meaning they require no energy input to move substances. Both processes are essential to the proper functioning of biological processes.