Question
What is the difference between Airmass and Air?
Solution
Airmass: An airmass is a large body of air whose physical properties, especially temperature and moisture control are relatively uniform. Naturally, an airmass extends over hundred of kilometres and consists of several layers each having homogeneous conditions.
Air: Air is the invisible mixture of gases (such as nitrogen and oxygen) that surrounds the Earth and that people and animals breathe. The space or sky that is filled with air.