What do we call a large bubble of air that has relatively uniform characteristics?

The term used to describe a large bubble of air that has relatively uniform characteristics is "air mass." An air mass is defined by its temperature and humidity properties, which are largely consistent throughout the mass. These characteristics develop over large geographical areas, which can influence weather patterns significantly when the mass moves.

Air masses can be classified into different types based on their source region, such as maritime or continental, and polar or tropical. Understanding air masses is essential because they play a critical role in the weather we experience. For instance, when two air masses meet, they can create weather fronts, leading to changes in weather conditions.

In contrast, an air current refers to the movement of air within the atmosphere, often associated with winds. Climate zones refer to broader categories of climate characterized by specific temperature, humidity, and precipitation conditions over extended periods. Weather fronts are boundaries that separate different air masses, leading to changes in weather but do not encompass uniform characteristics of air as an air mass does.