Which of the following best defines an air mass?

An air mass is best defined as a large section of the troposphere with uniform properties. This definition is supported by the characteristics of air masses, which are extensive bodies of air that have relatively consistent temperature and humidity throughout. They form over large areas, typically in regions with stable atmospheric conditions, such as over oceans or landmasses, where they acquire their specific properties.

Air masses can cover thousands of square miles, and their uniform characteristics are important for weather forecasting since they can affect the weather patterns in the regions they move into. These properties allow meteorologists to predict changes in weather when an air mass moves into a different area, bringing variations in temperature and moisture. Understanding air masses is crucial for aviation and meteorology because they play a significant role in determining weather conditions, which can impact flight safety and operations.