What do you call the boundary that separates different air masses?

The boundary that separates different air masses is known as a front. This term is used in meteorology to describe the transition zone between two distinct air masses, which typically have different temperatures and humidity levels. Fronts can be classified into several types, such as cold fronts, warm fronts, stationary fronts, and occluded fronts, each of which has its own characteristics and can lead to various weather phenomena.

Understanding fronts is crucial because they are often associated with significant changes in weather conditions, such as changes in temperature, precipitation, and wind patterns. For instance, when a cold front moves into an area, it can lead to thunderstorms and a drop in temperature, while a warm front can bring gradual warming and steady precipitation. By grasping the concept of fronts and their role in weather systems, one can better anticipate weather changes and patterns.