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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
|
| 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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