Air is a mixture of gases. Air is composed of molecules such as oxygen, nitrogen and carbon dioxide. Air also contains atoms of noble gases such as neon, argon etc.
Air is composed of 21% molecular oxygen and 78% molecular nitrogen. Also, there is about 0.03% of carbon dioxide molecules in air.
Air is generally defined as a mixture of gases owing to the number of gaseous substances that compose air.
Also, there is a trace amount of noble gases which largely exists as monoatomic species in air.
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