Composition of dry atmosphere, by volume[3]ppmv: parts per million by volume (note: volume fraction is equal to mole fraction for ideal gas only, see volume (thermodynamics))GasVolumeNitrogen
(N2)780,840 ppmv (78.084%)
Oxygen (O2)209,460 ppmv (20.946%)
Argon (Ar)9,340 ppmv (0.9340%)
Carbon...