Osmosis
The key idea
Osmosis is solvent transport through a selectively permeable membrane driven by differences in chemical potential; introductory treatments often express it through osmotic pressure.
Why it matters
It matters in cells, desalination, food science and solution chemistry, and is more precise than the vague idea that 'water simply moves toward salt'.
A picture to remember
It matters in cells, desalination, food science and solution chemistry, and is more precise than the vague idea that 'water simply moves toward salt'.