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  1. May 3, 2024 · 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. The atmospheric gases of steady concentration (and their proportions in percentage by volume)

  2. Oct 19, 2023 · ARTICLE. 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. Grades. 5 - 8. Subjects. Earth Science, Meteorology, Physics. Photograph. Parachuting through the Air.

  3. noun. us / er / uk / eə r/ air noun (GAS) Add to word list. A2 [ U ] the mixture of gases that surrounds the earth and that we breathe: fresh air I went outside to get some fresh air. You should put some air in your tires - they look flat to me. the air B2 [ S ] the space above the ground, especially high above the ground:

  4. In 2019, Columbus air quality index (AQI) averaged an annual score of 37 or “good.” The US Environmental Protection Agency (EPA) describes “good” air quality as air that generally poses little to no health risk. Similar “good” ratings have been achieved each year in Columbus since 2012.

  5. 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). How to use air in a sentence. Synonym Discussion of Air.

  6. 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 .

  7. noun. a mixture of nitrogen, oxygen, and minute amounts of other gases that surrounds the earth and forms its atmosphere. a stir in the atmosphere; a light breeze. overhead space; sky: The planes filled the air. circulation; publication; publicity: to give air to one's theories. the general character or complexion of anything; appearance:

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