Chemical substance constituting the Atmosphere of Earth.
The main composition compounds are: Nitrogen N2 (78%), 20.95% Oxygen O2 (21%), Argon Ar (0.9%) and Carbon dioxide CO2 (0.04% ).
The Density is 1.2754 kg/m3 at STP.
Table 1. Atmosphere of Earth composition
| Average composition of dry atmosphere (mole fractions) | ||
|---|---|---|
| Gas | ||
| Nitrogen, N2 | 78.084% | |
| Oxygen, O2[1] | 20.946% | |
| Minor constituents (mole fractions in ppm) | ||
| Argon, Ar | 9340 | |
| Carbon dioxide, CO2 | 400 | |
| Neon, Ne | 18.18 | |
| Helium, He | 5.24 | |
| Methane, CH4 | 1.7 | |
| Krypton, Kr | 1.14 | |
| Hydrogen, H2 | 0.55 | |
| Nitrous oxide, N2O | 0.5 | |
| Xenon, Xe | 0.09 | |
| Nitrogen dioxide, NO2 | 0.02 | |
| Water | ||
| Water vapour | Highly variable; typically makes up about 1% | |
See also
Natural Science / Physics / Chemistry / Chemical Substance