The behavior of temperature, humidity, and pressure within an air mass can be complex, but here are some general principles:
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Humidity: Humidity varies within an air mass and can affect the pressure. Higher humidity can lead to lower pressure because water vapor is less dense than the nitrogen and oxygen that typically make up the majority of air. Thus, regions of high humidity may have lower pressure compared to drier areas.
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Temperature: Temperature can vary within an air mass, particularly from the periphery to the center. Generally, an air mass can have a more uniform temperature, but it can still display temperature gradients, especially at the boundaries where different air masses meet.
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Pressure: Pressure tends to be relatively uniform within a single air mass but can still vary somewhat based on local conditions, such as elevation and humidity levels.
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Interaction with Boundaries: When two different air masses meet, the differences in temperature and humidity can lead to changes in pressure and weather patterns. The edges of an air mass often interact with other air masses, leading to varying conditions.
In conclusion, while pressures tend to be more uniform, humidity and temperature can vary within an air mass. The statement that best reflects these dynamics would be that temperature and humidity can vary, but pressure often remains relatively stable within an air mass.
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