Vapor is really diffused water molecules that appear as fog or mist. When water is heated, the molecules in the water vibrate and some of them escape into the air, thus becoming water vapor, or the gaseous state of water. That's why we call it eVAPORation. The liquid water becomes a gas known as vapor.

Where does vapour come from?

Water vapor can be produced from the evaporation or boiling of liquid water or from the sublimation of ice. Water vapor is transparent, like most constituents of the atmosphere. Under typical atmospheric conditions, water vapor is continuously generated by evaporation and removed by condensation.

How is vapour formed?

Water vapour is water in gaseous instead of liquid form. It can be formed either through a process of evaporation or sublimation. ... Water vapour in the atmosphere is often below its boiling point. When water is boiled the water evaporates much faster and makes steam.