Atmospheric Composition
| Average composition of dry atmosphere (mole fractions) | ||
|---|---|---|
| Gas | per NASA |
|
| Nitrogen, N2 | 78.084% | |
| Oxygen, O2 | 20.946% | |
| Argon, Ar | 0.934% | |
| Minor constituents (mole fractions in ppm) | ||
| Carbon Dioxide, CO2 | 383 | |
| Neon, Ne | 18.18 | |
| Helium, He | 5.24 | |
| Methane, CH4 | 1.7 | |
| Krypton, Kr | 1.14 | |
| Hydrogen, H2 | 0.55 | |
| Water | ||
| Water vapour | Highly variable; typically makes up about 1% |
|
Notes: the concentration of CO2 and CH4 vary by season and location. The mean molecular mass of air is 28.97 g/mol.
Read more about this topic: Atmospheric Chemistry
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