This the gaseous phase of water.
Fog is a good example of water vapor. It is made up of molecuels of water, though some particles are much larger but still light enough to float on the air.
water vapor
Water evaporating into the air is an example of the water cycle in nature. Evaporation is the process where liquid water turns into water vapor due to heat from the sun.
Evaporation, as when water is boiled. It changes phase, from a liquid to water vapor, a gas which is invisible.
Water forms by the condensation of water vapor.
water vapor
water vapor
water vapor
steam clouds water vapor
Steam (in all its uses), water vapor (as in humidity).
The condensing of water vapor in to water dropplets
For example, nuclear fuels.
an example of air pressure would be 45% of water vapor outside.
chemical change
condensation
condensation
Water vapor is the gaseous form of water; the steam that rises when you boil water, for example.