Liquids can also dissolve in a solvent, resulting in a liquid-liquid solution. For instance, alcohol (solute) dissolves in water (solvent). Conversely, if the amount of alcohol is greater than the amount of water, the water becomes the solute, and the alcohol is the solvent.

Liquids that can be mixed together to form a solution have a special name. These liquids are called miscible liquids. Liquids that do not dissolve when mixed together are called immiscible liquids. Oil and water are immiscible; they do not form a solution when mixed.