Gas N2

Ar co2

Xe ppmv (dry air) 780840 209460 9340 365 (1998) 18 5.2 1.8 1.1 0.5 0.09

The Crust

(from Mason, B. and C. B. Moore (1982). "Principles of Geochemistry," 4th edn. J. Wiley, New York)

Total average water content 1.3 x 1016 kg Average molecular mass of dry air 28.97 g/mol Moles of dry air in the atmosphere 1.8 x 1018 mol (ppmv = parts per million by volume)


ppm (mass)

ppm (atoms)

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