The crossword solution for the term 'evaporating rapidly' is 'VOLATILE'. Volatility is a measure of how quickly a substance evaporates. It is used to describe liquids and gases that evaporate quickly, such as gasoline or alcohol. In general, VOLATILE substances have a low boiling point and evaporate at room temperature. This makes them useful in many applications, such as cleaning agents, solvents, and aerosol propellants.