Vapor implies a Gaseous State. In the super-cooled Upper Atmospheric Layers, Water may exist only as solid Ice crystals.
Upper Part
Water Vapor and Carbon Dioxide
The amount of water vapor in atmospheric gases is highly variable. More water vapor is found at lower altitudes, at 30,000 feet there is virtually no water vapor. There is a maximum of 4% water vapor in the atmosphere at any time.
vapor
Water vapor is added to the atmosphere primarily by evaporation from bodies of water such as oceans, lakes, and rivers. Evapotranspiration from plants also contributes to the amount of water vapor in the atmosphere.
The main processes that return water vapor to the atmosphere are evaporation and transpiration. Evaporation occurs when liquid water changes into water vapor from sources such as oceans, lakes, and rivers. Transpiration is the process through which plants release water vapor from their leaves into the atmosphere. Both of these processes contribute to the water cycle by replenishing the atmosphere with water vapor.
The two characteristics of the atmosphere that allow it to retain water vapor on Earth are temperature and pressure. Warmer air can hold more water vapor than cooler air, and higher pressure air can hold more water vapor than lower-pressure air. This combination allows for the retention of significant amounts of water vapor in the Earth's atmosphere.
Evaporation, where water on the Earth's surface turns into water vapor, and transpiration, where plants release water vapor through their leaves, both add water vapor to the atmosphere.
The amount of water vapor in the stratosphere is much lower than in the lower atmosphere. The condensation of water vapor is what creates clouds (and rain, hail, snow, and other forms of precipitation) Also because weather occurs in the troposphere, and clouds are formed from water vapor, which is part of the water cycle, which is part of weather
Water vapor
Water vapor
The layer of the atmosphere that contains the most water vapor is the troposphere, the lowest layer of the atmosphere where most weather phenomena occur. Water vapor concentration decreases with height in the atmosphere as temperature decreases.