Final answer:
An air mass is a large body of air in the atmosphere with similar temperature and humidity characteristics throughout. Air masses are categorized based on their source region, and they interact to cause weather changes. Meteorologists use knowledge of air masses to forecast weather patterns.
Step-by-step explanation:
An air mass is a large body of air in the atmosphere that has similar temperature and humidity characteristics throughout. Air masses are categorized based on their source region, which determines their temperature and moisture content. For example, a tropical air mass originates from warm and humid regions near the equator, while a polar air mass originates from cold and dry polar regions.
Air masses move and interact with each other, causing changes in weather conditions. When two air masses meet, a front is formed, resulting in the development of different weather phenomena such as rain, storms, or clear skies.
Understanding air masses and their movements is important for meteorologists to forecast weather patterns and for individuals to make informed decisions based on current and future weather conditions.