That's the solute.

Remember, sugar is our solute.

Now let's put some solute in it.

And so you would have your traditional diffusion, where high concentration of solute to low concentrations of solute.

So let's say that the solute is sugar.

And a solution has a solvent and the solute.

So the concentration of the solute is higher here.

And let's say solution number 2 has more of the solute.

Well, it's permeable to water, but the solute cannot go through the membrane.

Which side of the membrane has a higher or lower concentration of solute?

So let's say we have two solutions that contain some type of solute.

Now let's say that solution 1 has less of the solute in it.

This box is used to specify the units for the amount of solute in the solution.

And then in hypotonic, not too much of the solute so you have a low concentration.

We've talked about diffusion and so far we've been talking about the diffusion of the solute, right?

And whatever there is less of, so the more water is the solvent and in that case, that is the in this case, that is the sugar that is considered the solute. this is the solute, so the sugar.

It could be any molecule that there's less of, in the water, in this case,sugar. is the solute

Let's dissolve some solute in it and let's say we do all the dissolving on the left hand side.

We have the solvent flowing from a hypotonic situation to a hypertonic solution, but it's only hypotonic in the solute.

But, so, you know, so these are just good prefixes to know, but hypertonic you have a lot of the solute.

So it's actually going to go from the hypotonic side when we talk about low concentration of solute to the side that has high concentrations of solute, of sugar and actually, if this thing is stretchable, more water will keep flowing in and this membrane will stretch out.

But what happens if we have a tunnel where the solute is too big to travel, but water is small enough to travel?

And let's just assume that we are shining at a wavelength of light that is specifically sensitive to the solute that we have dissolved in here.

And usually you're talking about the diffusion of water as a solvent and usually it's in the context of a semi permeable membrane, where the actual solute cannot travel through the membrane.

And in general and this is not always the case if you want to be as general as possible, the solute is whatever you have less of, the solvent is whatever you have more of.

So in general, diffusion if there's no barriers to the diffusion like we had here, you will have the solute go from a high concentration or hypertonic solution if they can travel to a hypotonic solution, to a hypo, where the concentration is lower.

Or another way to say it is that the absorbance is equal to some constant it's usually a lowercase epsilon like that and this is dependent on the solution, or the solute in question, what we actually have in here, and the temperature, and the pressure, and all of that.