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Composition of the Earth's Atmosphere
Source: Definition of the U.S. Standard Atmosphere (1976)
CRC Handbook of Chemistry and Physics, 77th Edition
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| Gas | | Formula | | Abundance
percent by volume | | Abundance
parts per million by volume | | | Nitrogen | | N2 | | 78.084% | | 780,840 | | | Oxygen | | O2 | | 20.9476% | | 209,476 | | | Argon | | Ar | | 0.934% | | 9,340 | | | Carbon Dioxide | | CO2 | | 0.0314% | | 314 | | | Neon | | Ne | | 0.001818% | | 18.18 | | | Helium | | He | | 0.000524% | | 5.24 | | | Methane | | CH4 | | 0.0002% | | 2 | | | Krypton | | Kr | | 0.000114% | | 1.14 | | | Hydrogen | | H2 | | 0.00005% | | 0.5 | | | Xenon | | Xe | | 0.0000087% | | 0.087 |
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