What will occur when a saturated solution of a solute is cooled, if the solute does not crystallise?
The solubility of many things increases with increasing temperature and decreases with decreasing temperature (the case is different with some gases). Decreasing the temperature of a solution that is already saturated will lead it to be supersaturated.
A saturated solution is a solution that contains the maximum amount of a solute that it can contain at a particular temperature. If the temperature is decreased, without the solute crystallizing out, the solution will become supersaturated.