Equilibrium and actual concentrations of constituents of the Earth's atmosphere.

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Species	Expected	Present	Total	Output	Residence
	fractional	fractional	mass	kg yr-1	time
	equilibrium	concentration	kg
	concentration
N2	< 10-10	0.78	3.9 x 1018	2.5 x 1011	1.6 x 107 yr
CH4	< 10-35	1.7 x 10-6	4.8 x 1012	7.5 x 1011	6 yr
N2O	< 10-20	3 x 10-7	2.3 x 1012	1 x 1011	20 yr
NH3	< 10-35	10-9	3.0 x 109	1 x 1011	10 days
H2	< 10-35	5.3 x 10-7	1.9 x 1011	5 x 1010	4 yr

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Adapted from: Richard P. Wayne, 1985: Chemistry of Atmospheres. Clarendon Press, Oxford. 361 pp.

Notes:

Mass of the atmosphere: 5.14 x 10¹⁸ kg.
Kmols in the atmosphere: 1.78 x 10¹⁷
Number of molecules in the atmosphere: 1.07 x 10⁴⁴