Sometimes the word “atmosphere” is used instead of the word “air”. Standard Dry Air is the composition of gases that make up air at sea level. It is a standard scientific unit of measurement. Standard dry air consists of nitrogen, oxygen, argon, carbon dioxide, neon, helium, krypton, hydrogen and xenon.
Definition of air
(Entry 1 of 2) 1a : the mixture of invisible odorless tasteless gases (such as nitrogen and oxygen) that surrounds the earth also : the equivalent mixture of gases on another planet…the thin, frigid air of Mars. — Stefano S. Coledan.
Almost the entire earth’s atmosphere consists of just five gases: nitrogen, oxygen, water vapour, argon and carbon dioxide. Several other connections also exist.
The air in the Earth’s atmosphere is made up of approximately 78% nitrogen and 21% oxygen. Air also contains small amounts of other gases such as carbon dioxide, neon and hydrogen.
The definition of air is the mixture of oxygen, nitrogen and other gases that are constantly present around us. A cool breeze is an example of air. Air conditioning.
Air is used as a verb meaning to expose something to the air, to the public, or to a broadcast. The word air has many other meanings, both as a noun and as a verb. Scientifically speaking, the word air refers to an invisible mixture of gases including oxygen, nitrogen and small amounts of many other gases.
Nitrogen – 78% Oxygen – 21% Carbon Dioxide – 0.03%
The molecules of two different elements, nitrogen and oxygen, make up about 99 percent of air. The rest contains small amounts of argon and carbon dioxide. (Other gases such as neon, helium, and methane are present in trace amounts.) Oxygen is the life-giving element in air.
According to the education site Vision Learning (opens in new tab), the Earth’s atmosphere is composed of approximately 78% nitrogen, 21% oxygen, 0.93% argon, 0.04% carbon dioxide, and traces of neon, helium, methane, Krypton, ozone and hydrogen as well as water vapor.
Air is a gas (as opposed to a liquid or solid) and contains approximately 78% nitrogen, 21% oxygen and 1% argon. There are other trace gases in the air such as helium, carbon dioxide and neon to name a few.
Air is a mixture of gases, 78% nitrogen and 21% oxygen with traces of water vapour, carbon dioxide, argon and various other components. We typically model air as a unitary (no fluctuations or fluctuations) gas with properties averaged from all individual components.