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  2. Because the troposphere is the lowest atmosphere layer, it contains 75 percent of the atmosphere’s mass. From largest to smallest, Earth’s atmosphere composition contains nitrogen, oxygen, argon, CO 2 , and trace gases.

  3. The three gases with the highest percentages in the atmosphere are all elements: 78% nitrogen, N₂; 21% oxygen, O₂; 0.9% argon, Ar; These three gases make up 99.9% of the...

  4. Jun 16, 2018 · The most abundant gases in the atmosphere depend on temperature, altitude and water, but they are usually nitrogen, oxygen, argon, and carbon dioxide.

    • Anne Marie Helmenstine, Ph.D.
  5. By mole fraction (i.e., by quantity of molecules), dry air contains 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other trace gases. Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere.

  6. Jul 2, 2024 · In short, the atmosphere is the protective bubble in which we live. This protective bubble consists of several gases (listed in the table below), with the top four making up 99.998% of all gases. Of the dry composition of the atmosphere, nitrogen by far is the most common.

  7. Some of the gases are "permanent," meaning that their concentrations are basically constant. Other gases are "variable," meaning that their concentrations vary from time to time and place to place. I've summarized the gases that comprise our atmosphere and their concentrations in the table below:

  8. Jan 21, 2023 · The atmospheric gases fall into three abundance categories: major, minor, and trace. Nitrogen, the most abundant component, has accumulated over time as a result of its geochemical inertness; a very small fraction of it passes into the other phases as a result of biological activity and natural fixation by lightning.

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