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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 | Dictionary. com The terms air or the air is used generally to refer to the sky or open space outside Real-life example: Airplanes and helicopters are designed to fly in the air, meaning the empty space over the ground
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
Whats in the Air? - Center for Science Education Air is a mixture of naturally occurring gases and human-made air pollutants Learn more about these gases and the role they play in our atmosphere
Properties of Air - Text Version | Glenn Research Center | NASA Air is a mixture of gases, 78% nitrogen and 21% oxygen with traces of water vapor, carbon dioxide, argon, and various other components We usually model air as a uniform (no variation or fluctuation) gas with properties that are averaged from all the individual components