4. What is the relative proportions of nitrogen and oxygen in the air ?
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By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere.
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ᵀᴴᴱ ᴬᴵᴿ ᴵᴺ ᴱᴬᴿᵀᴴ'ˢ ᴬᵀᴹᴼˢᴾᴴᴱᴿᴱ ᴵˢ ᴹᴬᴰᴱ ᵁᴾ ᴼᶠ ᴬᴾᴾᴿᴼˣᴵᴹᴬᵀᴱᴸᵞ 78 ᴾᴱᴿᶜᴱᴺᵀ ᴺᴵᵀᴿᴼᴳᴱᴺ ᴬᴺᴰ 21 ᴾᴱᴿᶜᴱᴺᵀ ᴼˣᵞᴳᴱᴺ. ᴬᴵᴿ ᴬᴸˢᴼ ᴴᴬˢ ˢᴹᴬᴸᴸ ᴬᴹᴼᵁᴺᵀˢ ᴼᶠ ᴸᴼᵀˢ ᴼᶠ ᴼᵀᴴᴱᴿ ᴳᴬˢᴱˢ, ᵀᴼᴼ, ˢᵁᶜᴴ ᴬˢ ᶜᴬᴿᴮᴼᴺ ᴰᴵᴼˣᴵᴰᴱ, ᴺᴱᴼᴺ, ᴬᴺᴰ ᴴᵞᴰᴿᴼᴳᴱᴺ.
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