Water vapour is water in the gas phase, produced by the evaporation or boiling of water. Steam is water vapour produced by boiling. So steam is water vapour. Steam is invisible, but when steam cools it condenses into tiny liquid water droplets and then we can see it. read more
A cloud is a visible mass of liquid droplets or frozen crystals made of water and/or various chemicals suspended in the atmosphere above the surface of a planetary body. They are also known as aerosols. WATER VAPOR. Water vapor, also aqueous vapor, is the gas phase of water. read more