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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 | 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 - 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
Air - Simple English Wikipedia, the free encyclopedia Air is a mixture of many gases and tiny dust particles It is the clear gas in which living things live and breathe It has an indefinite shape and volume It has mass and weight, because it is matter The weight of air creates atmospheric pressure There is no air in outer space
Home | American Institutes for Research Since 1946, AIR has worked with federal, state, and local governments to improve the lives of everyday American citizens in the areas of education, health, and the workforce—from evaluating the quality of nursing homes to finding out what works so our students can compete on a global stage
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