Fish are constantly surrounded by water, but do they get thirsty? And how would they even drink?
To answer these question, it's crucial to understand how water — a solvent — interacts with other substances like salt, which is a solute, across a cell membrane. Through a process called osmosis, water flows across a membrane from areas with low concentrations of solutes to areas with high concentrations of solutes until the cell can reach some sort of equilibrium with its external environment.
