The air is a mixture of several gases which are colorless and transparent. Almost 4/5 of the air is made up of a gas called nitrogen, which is very valuable to plants and therefore to us. About a fifth is made up of oxygen, which we must have breathe. There are also small amounts of other gases. Among these is carbon dioxide, and small amounts of the so-called inert gases: argon, neon, helium, krypton and xenon. Air also contains varying amounts of water in the form op vapor, or gas.
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