An air mass is a large volume of air in the atmosphere that is mostly uniform in temperature and moisture. They can extend thousands of miles across the surface and can go from the ground level to the stratosphere 16 kilometers (10 miles) into the atmosphere. Air masses can be classified as either as Arctic Air masses, Tropical Air masses, Polar Air masses, and Equatorial Air Masses. 
Sources[edit | edit source]
- "Air Mass". National Geographic Society. Retrieved 2023-05-09.