Osmosis is the movement of water from an area of high concentration to an area of low concentration, across a partially-permeable membrane.
I paid attention in biology - so no, it IS diffusion, bitch.
I used to drop black paint in the water and watched as it did this. I pretended it was the Death Eaters or the memories collecting and swirling in the Pensive.
I paid attention in biology - so no, it IS diffusion, bitch.