One way to determine the degree of saturation of a solid-liquid solution is to drop a crystal of the solute into the solution.?

When a crystal of the solute is dropped into a solid-liquid solution, its behavior indicates the degree of saturation. If the crystal dissolves, the solution is unsaturated, meaning it can still dissolve more solute. If the crystal remains unchanged, the solution is saturated, indicating it holds the maximum amount of solute at that temperature and pressure. If the crystal grows in size, the solution is supersaturated, as it contains more solute than it can normally hold at equilibrium.