Each concept here is mapped to its prerequisites — the ideas you'd need first to understand it — all the way down to four foundations: Space, Time, Energy, Pattern. Click any prerequisite to drill down, or scroll for the chain graph.
A gaseous substance occupying a portion of space within an environment, characterized by its intangibility and ability to exert pressure, which is a fundamental aspect of the environment and its interactions with living and non-living components.
External reference — all senses of the word “air element” on Wiktionary. This atlas concept maps to only the slice of meaning relevant to the prerequisite graph.