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When heat from the lower air spreads through a larger volume, the mass of air becomes cooler.Cool air is less able to hold water vapor than warm air.Venture outside and you encounter numerous features of weather.
The boundary between two air masses is called a weather front.
Here, wind, temperature, and humidity change abruptly, producing atmospheric instability.
Differential warming, as a result, causes changes in the temperature and weight of overlying air masses.
As an air mass warms, it becomes lighter and rises higher into the atmosphere.
Fast-moving, upper atmosphere winds known as jet streams help move weather systems around the world.