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. See examples of air used in a sentence. Our recently redesigned site highlights air quality in your local area first, while still providing air quality information at state, national, and world views. Apr 29, 2026 · 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 … Oct 1, 2024 · 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. Of or relating to the air or the movement of air: an air tube. Existing or living in the air; aerial. Powered by compressed air: an air horn. Containing or inflated by air.
