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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
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
AIR Definition Meaning | Dictionary. com Air definition: a mixture of nitrogen, oxygen, and minute amounts of other gases that surrounds the earth and forms its atmosphere See examples of AIR used in a sentence
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
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 - 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