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Air | Composition, Oxygen, Nitrogen | Britannica air, mixture of gases comprising the Earth’s atmosphere The mixture contains a group of gases of nearly constant concentrations and a group with concentrations that are variable in both space and time
AIR Definition Meaning - Merriam-Webster The meaning of AIR is the mixture of invisible odorless tasteless gases (such as nitrogen and oxygen) that surrounds the earth; also : the equivalent mix of gases on another celestial object (such as a planet)
Air - National Geographic Society Air is the invisible mixture of gases that surrounds Earth Air contains important substances, such as oxygen and nitrogen, that most species need to survive
What does air mean? - Definitions for air a particular state of the atmosphere, as respects heat, cold, moisture, etc , or as affecting the sensations; as, a smoky air, a damp air, the morning air, etc Air noun
Air - definition of air by The Free Dictionary 1 Of or relating to the air or the movement of air: an air tube 2 Existing or living in the air; aerial 3 Powered by compressed air: an air horn 4 Containing or inflated by air
AirNow. gov AirNow is your one-stop source for air quality data Our recently redesigned site highlights air quality in your local area first, while still providing air quality information at state, national, and world views