Permanent Gases | Chemical Composition | Percent by Volume | Parts per Million (ppm) |
---|---|---|---|
Nitrogen | |||
Oxygen | |||
Argon | |||
Neon | |||
Helium | |||
Hydrogen | |||
Xenon |
Variable Gases | Chemical Composition | Percent by Volume | Parts per Million (ppm) |
---|---|---|---|
Water vapor | |||
Carbon dioxide | |||
Methane | |||
Nitrous Oxide | |||
Ozone | |||
CFCs |