The vapor, itself an invisible gas, arises from evaporation, whereby water molecules escape from a liquid. Evaporation is a slower process than boiling but is accelerated when water heats up (gaining increased energy).

How Vapour is formed?

Water vapour is water in gaseous instead of liquid form. It can be formed either through a process of evaporation or sublimation. ... Water vapour in the atmosphere is often below its boiling point. When water is boiled the water evaporates much faster and makes steam.

Where do water Vapour come from in the atmosphere?

Heat from the Sun causes water to evaporate from the surface of lakes and oceans. This turns the liquid water into water vapor in the atmosphere. Plants, too, help water get into the atmosphere through a process called transpiration!