Atmospheric humidity is the amount of water vapour contained in the air. It represents a very small percentage of the water present on Earth (about 0.01%), but it is very important for the role it plays in the water cycle. It is in fact through atmospheric humidity that water moves, passing from oceans and seas to dry land: nearly all the water vapour that is present in the atmosphere originates from the evaporation of the ocean and sea waters and the contribution of continental sheets of water and evapotranspiration of the land and vegetation is very small.
Atmospheric humidity is not distributed uniformly, but varies greatly in the different regions of the Earth: both regions where the atmospheric humidity is very high and others in which the air is dry and devoid of water vapour, like in the desert regions, can be observed.

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