
AIR Definition & Meaning - Merriam-Webster
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 …
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 …
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.
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 …
AIR | English meaning - Cambridge Dictionary
AIR definition: 1. the mixture of gases that surrounds the earth and that we breathe: 2. the space above the…. Learn more.
Air: What is, composition, functions, properties and pollution
Mar 19, 2025 · Air is a mixture of gases that constitutes the Earth’s atmosphere and is essential for life on our planet. Composed mainly of nitrogen and oxygen, air performs vital functions …
Is Air? - The Institute for Environmental Research and Education
Jun 12, 2025 · Air is the mixture of gases that surrounds the Earth, while wind is simply air in motion. Wind is caused by differences in air pressure, with air flowing from areas of high …
What's in the Air? - Center for Science Education
Air is a mixture of gases, most of which are naturally occurring. Air also contains a significant amount of human-made air pollutants, including some that are not safe to breathe and some …
Air Properties Definitions | Glenn Research Center | NASA
Jun 24, 2025 · 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 …
Air - Energy Education
Air is a mixture of several gases that is a precious resource and a necessity of life. Pure air is completely invisible and odourless, however pollutants in the air can cause it to have a …