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Table 7a-1 lists the eleven most abundant gases found in the Earth's lower atmosphere by volume. Of the gases listed, nitrogen, oxygen, water vapor, carbon dioxide, methane, nitrous oxide, and ozone are extremely important to the health of the Earth's biosphere.The table indicates that nitrogen and oxygen are the main components of the atmosphere by volume.able 7a-1 lists the eleven most abundant gases found in the Earth's lower atmosphere by volume. Of the gases listed, nitrogen, oxygen, water vapor, carbon dioxide, methane, nitrous oxide, and ozone are extremely important to the health of the Earth's biosphere.
Nearly all of the Earth's atmosphere is made up of only five gases: nitrogen, oxygen, water vapor, argon, and carbon dioxide. Several other compounds also are present. Although this CRC table does not list water vapor, air can contain as much as 5% water vapor, more commonly ranging from 1-3%. The 1-5% range places water vapor as the third most common gas (which alters the other percentages accordingly). Answer: This is composition of air in percent by volume, at sea level at 15Â°C and 101325 Pa. Nitrogen -- N 2 -- 78.084%. Oxygen -- O 2 -- 20.9476%. Argon -- Ar -- 0.934%. Carbon Dioxide -- CO 2 -- 0.0314%. Neon -- Ne -- 0.001818%. Methane -- CH 4 -- 0.0002%. Helium -- He -- 0.000524%. Krypton -- Kr -- 0.000114%.