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Air
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==Key Stage 4==
===Meaning===
The [[air]] is a [[mixture]] of [[gas]]es that we breathfound in the [[Earth's Atmosphere]].
===About the Air===
: The main [[gas]]es are; [[Nitrogen]] (78%), [[Oxygen]] (21%), [[Argon]] (1%), [[Carbon Dioxide]] (0.04%) and [[Water Vapour]] (% varies).