A ==Key Stage 2=====Meaning===The [[air]] is what we breath in. ==Key Stage 3=====Meaning===The [[air]] is a [[mixture]] of [[gas|gases]] es that we breath. ===About the Air===: The main [[gas]]es are; [[Nitrogen]] (78%), [[Oxygen]] (21%), [[Argon]] (1%), [[Carbon Dioxide]] (0.04%) and [[Water Vapour]] (% varies). ==Key Stage 4=====Meaning===The [[air]] is a [[mixture]] of [[gas]]es found in the [[Earth's Atmosphere]]. ===About the Air===: The main [[gas|gases]] es are; [[Nitrogen]](78%), [[Oxygen]](21%), [[Argon]](1%), [[Carbon Dioxide]] (0.04%) and [[Water vaporVapour]](% varies). ===Extra Information==={{#ev:youtube|https://www.youtube.com/watch?v=VDf00z8sMFw}} ===References=======AQA====:[https://www.amazon.co.uk/gp/product/0008158762/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158762&linkCode=as2&tag=nrjc-21&linkId=a0fffa35b3ea49a63404f6704e0df7cc ''Air, page 96, GCSE Chemistry; Student Book, Collins, AQA']:[https://www.amazon.co.uk/gp/product/0008158762/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158762&linkCode=as2&tag=nrjc-21&linkId=a0fffa35b3ea49a63404f6704e0df7cc ''Air; as a mixture, pages 204-5, 316, GCSE Chemistry; Student Book, Collins, AQA'] ====OCR==== :[https://www.amazon.co.uk/gp/product/0198359829/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359829&linkCode=as2&tag=nrjc-21&linkId=90e8d7b4f039d53035238fa0320fe00b ''Air; atmosphere, pages 252-253, Gateway GCSE Chemistry, Oxford, OCR '']:[https://www.amazon.co.uk/gp/product/0198359829/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359829&linkCode=as2&tag=nrjc-21&linkId=90e8d7b4f039d53035238fa0320fe00b ''Air; corrosion of metals, pages 216-219, Gateway GCSE Chemistry, Oxford, OCR '']:[https://www.amazon.co.uk/gp/product/0198359837/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359837&linkCode=as2&tag=nrjc-21&linkId=3c4229e8b023b2b60768e7ea2307cc6f ''Air; Electrical conduction, pages 95, 104, Gateway GCSE Physics, Oxford, OCR '']:[https://www.amazon.co.uk/gp/product/0198359829/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359829&linkCode=as2&tag=nrjc-21&linkId=90e8d7b4f039d53035238fa0320fe00b ''Air; liquefied, page 196, Gateway GCSE Chemistry, Oxford, OCR '']:[https://www.amazon.co.uk/gp/product/0198359829/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359829&linkCode=as2&tag=nrjc-21&linkId=90e8d7b4f039d53035238fa0320fe00b ''Air; pollution, pages 60, 254,255, Gateway GCSE Chemistry, Oxford, OCR '']:[https://www.amazon.co.uk/gp/product/0198359837/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359837&linkCode=as2&tag=nrjc-21&linkId=3c4229e8b023b2b60768e7ea2307cc6f ''Air; Resistance, pages 70, 104, Gateway GCSE Physics, Oxford, OCR '']