Water vapor

Water vapor, water vapour, or aqueous vapor is the gaseous phase of water. It is one state of water within the hydrosphere. 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.
It is less dense than most of the other constituents of air and triggers convection currents that can lead to clouds and fog.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 4.0

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