air
homogeneous mixture of the gaseous substances nitrogen, oxygen, and smaller amounts of other substances; gas mixture present in the Earth's atmosphere
compressed air
air kept under a pressure that is greater than atmospheric pressure
sea air
air at or near the sea shore, traditionally thought to carry health benefits
air mass
widespread body of air approximately homogeneous in its horizontal extent with vertical temperature and moisture variations that are approximately the same over its horizontal extent
liquid air
air that has been condensed into a liquid
breathing air
air quality suitable for safe breathing