- water in the gaseous state, esp when due to evaporation at a temperature below the boiling pointCompare steam
Examples from the Web for water vapour
Historical Examples of water vapour
Dew-point, the temperature at which the air is saturated with the water-vapour which it contains.The New Gresham Encyclopedia
We cannot say if, or to what extent, these clouds consist of water-vapour.The Story of Evolution
Every one knows that there is abundance of water-vapour in the atmosphere, but the question arises, How does it get there?
An immense amount of evaporation takes place from these mighty rivers, so that the air above them becomes laden with water-vapour.
For each degree of temperature there is a certain amount of water-vapour which can be absorbed, and no more.