| Gas | Ratio compared to Dry Air(%) | Molecular Mass - M -(kg/kmol) | Chemical Symbol | Boiling Point | ||
|---|---|---|---|---|---|---|
| By volume | By weight | (K) | (oC) | |||
| Oxygen | 20.95 | 23.20 | 32.00 | O2 | 90.2 | -182.95 |
| Nitrogen | 78.09 | 75.47 | 28.02 | N2 | 77.4 | -195.79 |
| Carbon Dioxide | 0.03 | 0.046 | 44.01 | CO2 | 194.7 | -78.5 |
| Hydrogen | 0.00005 | ~ 0 | 2.02 | H2 | 20.3 | -252.87 |
| Argon | 0.933 | 1.28 | 39.94 | Ar | 84.2 | -186 |
| Neon | 0.0018 | 0.0012 | 20.18 | Ne | 27.2 | -246 |
| Helium | 0.0005 | 0.00007 | 4.00 | He | 4.2 | -269 |
| Krypton | 0.0001 | 0.0003 | 83.8 | Kr | 119.8 | -153.4 |
| Xenon | 9 10-6 | 0.00004 | 131.29 | Xe | 165.1 | -108.1 |
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