When boiling water, the level of water decreases and will disappear after a while. I guess this has something to do with the condensation of water vapour into the visible white "steam" or "cloud". What is above the "cloud"? Does the water molecules just escape? I thought they would go back to liquid water through condensation? I'm confused.
when you boil water, you convert it into water vapor, which leaves the pot and mixes with the atmosphere. If you boil the pot long enough, eventually all the water in it is converted to vapor and leaves. the pot is then empty.