Water vapor cannot occupy more than 4% of the atmospheric volume at any given point and time.
The water-vapor content present in the atmosphere greatly varies from place to place as well as from time to time because the humidity capacity of air is determined by the factor of temperature. At the point of 30 °C, for example, if a volume of air can contain up to a range of 4 percent water vapor, then when it is at -40 °C, generally, it cannot hold more than the range of 0.2 percent.
Water vapor gets passed into the air mainly by the process of evaporation as some of the liquid water arising from the ocean, lakes as well as rivers turns out into water vapor and travels throughout the air. When air rises above from atmosphere it gets very cooler and will be under less pressure. When the cooling of air takes place, some of the water vapor gets condensed.
So, in general, water vapor cannot occupy beyond 4% of the volume of the atmosphere.
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