Question

what is the importance of water vapour in the atmosphere

Answer 1

Importance of water vapour in the atmosphere is that it helps in the process of water cycle. Due to evaporation, water evaporates and changes to water vapour. When water vapour goes up, it mixes with dust particles and other gases to form clouds. When the clouds become heavier, then water vapours again fall down to earth surface in the form of rain. In this way water vapour plays a major role in the process of water cycle.
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Answer 2

The water vapours and dust particles are the other important components present in the atmosphere. They have their own relevance. The atmosphere also holds solid particles of dust, salt, pollen, etc. These dust particles act as hydroscopic nucleus around which water vapours get condensed to form clouds.