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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 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. 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 is the invisible mixture of gases that surrounds earth Air contains important substances, such as oxygen and nitrogen, that most species need to survive. The meaning of air is the mixture of invisible odorless tasteless gases (such as nitrogen and oxygen) that surrounds the earth The equivalent mix of gases on another celestial object (such as a planet). The mixture of gases that surrounds the earth and that we breathe Compton air quality index (aqi) is now good Read the air pollution in compton, usa with. Pure, dry air has a density of 1.293 kg m−3 at a temperature of 273 k and a pressure of 101.325 kpa Apart from the variability of water vapor, the composition of air is essentially constant to an altitude of at least 50 km. Air is a mixture of gases, most of which are naturally occurring