Water vapor refers to water that is in a vaporous form, which diffuses in the atmosphere but below boiling temperature. Water vapor in the atmosphere serves as the raw material for cloud and rain formation.
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what is water vapor
a dispersion, in air, of molecules of water, especially as produced by evaporation at ambient temperatures rather than by boiling.
Water vapor is water in a gas state, instead of liquid or solid. Many people think clouds are made of water vapor, but that is not true. Clouds are made of water droplets. When you see a puddle in the sun and it slowly dries up. That is liquid water changing to water vapor. You can find more information here: http://www.weatherquestions.com/What_is_water_vapor.htm