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  2. Atmosphere of Earth - Wikipedia

    en.wikipedia.org/wiki/Atmosphere_of_Earth

    Air composition, temperature and atmospheric pressure vary with altitude. ... Fifty percent of the total mass of the atmosphere is located in the lower 5.6 km (3.5 mi ...

  3. Density of air - Wikipedia

    en.wikipedia.org/wiki/Density_of_air

    The density of air or atmospheric density, ... Composition of dry atmosphere, by volume [ note 1] ... percentage ppmv: percentage ppmv percentage

  4. Template:Table composition of dry atmosphere - Wikipedia

    en.wikipedia.org/wiki/Template:Table_composition...

    Composition of dry atmosphere, by volume [ note 1] [ note 2] Gas (and others) Various [1] CIPM-2007 [2] ... percentage ppmv: percentage ppmv: percentage ppmv percentage

  5. Gas composition - Wikipedia

    en.wikipedia.org/wiki/Gas_composition

    The standards below are two examples of commonly used and cited publications that provide a composition for standard dry air: ISO TR 29922-2017 provides a definition for standard dry air which specifies an air molar mass of 28,965 46 ± 0,000 17 kg·kmol-1. [2] GPA 2145:2009 is published by the Gas Processors Association.

  6. Atmosphere - Wikipedia

    en.wikipedia.org/wiki/Atmosphere

    The composition of Earth's atmosphere is determined by the by-products of the life that it sustains. Dry air (mixture of gases) from Earth's atmosphere contains 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and traces of hydrogen, helium, and other "noble" gases (by volume), but generally a variable amount of water vapor is ...

  7. Carbon dioxide in Earth's atmosphere - Wikipedia

    en.wikipedia.org/wiki/Carbon_dioxide_in_Earth's...

    About 1,050 gigatonnes remain in the atmosphere following absorption by oceans and land. [18] Some fraction (a projected 20–35%) of the fossil carbon transferred thus far will persist in the atmosphere as elevated CO 2 levels for many thousands of years after these carbon transfer activities begin to subside. [19] [20]

  8. Trace gas - Wikipedia

    en.wikipedia.org/wiki/Trace_gas

    Trace gases are gases that are present in small amounts within an environment such as a planet's atmosphere.Trace gases in Earth's atmosphere are gases other than nitrogen (78.1%), oxygen (20.9%), and argon (0.934%) which, in combination, make up 99.934% of its atmosphere (not including water vapor).

  9. Atmosphere of Mars - Wikipedia

    en.wikipedia.org/wiki/Atmosphere_of_Mars

    The atmosphere of Mars is the layer of gases surrounding Mars.It is primarily composed of carbon dioxide (95%), molecular nitrogen (2.85%), and argon (2%). [3] It also contains trace levels of water vapor, oxygen, carbon monoxide, hydrogen, and noble gases.