The Earth’s atmosphere takes up about 4.2 billion cubic kilometres, and weighs about 5x1018 kg. That’s 5,000,000,000,000,000,000 kg.
Nitrogen takes up 78.09% of this volume, oxygen 20.95% and argon 0.93%. The remaining 0.03% consists of carbon dioxide, methane, nitrous oxide and ozone plus very small amounts of other gases.


