11.1: Introduction

We’ve already learned that areas of low and high pressure can be identified based on the isobars on a weather map. We’ve also learned that some regions on Earth typically have low pressure and while others typically have high pressure. In this chapter we’ll learn that some regions of the atmosphere have similar air properties and are named by those properties as a collective mass of air or “air mass”. High pressure systems, especially, are very common air masses.

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