The state of water going from a liquid to a gas is called evaporation. It’s often metaphorical for the process of change and transformation. In dreams, it can signify the passage of time, or the dissolution of things in your life. In the same way, it can be said that when someone falls asleep, their worries about their problems are also converted into air and vanish.
One interpretation is that evaporation signifies change or transformation, which is not always a good thing. Another interpretation says that it symbolizes progress and movement toward something better.
In some cases, people say that the dreams about evaporation signify that you are unable to get over your past mistakes or regrets. It may also represent how you feel like your life is slipping away from you. Evaporation in a dream may symbolize an escape from reality or feeling oppressed by the burdens of life and responsibility.