Water vapor refers to the gaseous form of water. It is created when water evaporates and turns into an invisible gas that floats in the air. Full definition
Is this an early indication of the feedback of water vapor in climate change, transport, or unknown chemistry? (esrl.noaa.gov)
If such a flood had taken place the amount of water vapor in the air would have made it impossible for any air breathing creature to breathe. (religion.blogs.cnn.com)
The assumptions of increasing water vapor content from increased air temperature over water is not generally valid. (scienceofdoom.com)