What is the boundary between two air masses with different temperatures known as?

The boundary between two air masses with different temperatures is known as a front. This is a crucial concept in meteorology, as fronts play a significant role in weather patterns. When two air masses meet, their differing temperatures and humidity levels can lead to various weather phenomena, including precipitation, storms, or clear skies, depending on the characteristics of the air masses involved.

Fronts can be classified further into different types, such as cold fronts, warm fronts, and stationary fronts, each having its own unique effects on weather. Understanding fronts is essential for predicting how air masses will interact and what kind of weather to expect as a result.

In contrast, a pressure zone refers to areas where high or low atmospheric pressure is found, but it does not specify the interaction between different air masses. A cold front specifically describes a type of front where a colder air mass replaces a warmer air mass, leading to specific weather conditions but does not encompass the broader concept of "front." A weather system is a general term that can describe a range of atmospheric phenomena but lacks the specificity associated with air mass boundaries.