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what is air?
There is air all round us.We cannot see air but we can feel it.When it moves we call it a wind.Air was once considered to be a single substance.Later in the eighteenth century,it was discovered that air is a mixture of gases,which consists mainly of nitrogen(78%) and oxygen(21%).The rest of the 1% includes carbon di oxide (0.03%) and other gases such as Argon,Neon etc.


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