Composition of air
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Major Gases in Air: Nitrogen, Oxygen, Argon, and Carbon Dioxide
Air is primarily a mixture of several gases. The two main components are nitrogen, which makes up about 78% of air, and oxygen, which accounts for about 21% Rusoke-Dierich2018Akhtar2007Rohli2021+3 MORE. Argon is the next most abundant gas, present at about 0.93%, while carbon dioxide is found at roughly 0.03% Akhtar2007Gul2021. Water vapor is also present in varying amounts, typically ranging from 0% to 2% depending on humidity .
Trace Gases and Inert Components in Atmospheric Air
Besides the major gases, air contains small amounts of other gases such as neon, krypton, xenon, hydrogen, and helium. These are often called noble or inert gases because they are chemically unreactive and do not participate in biological processes . Trace gases, even in very small quantities, can have significant effects on the atmosphere’s radiation balance and chemical reactions Glueckauf1951Brimblecombe1986Gul2021.
Particulates and Other Non-Gaseous Components
Air is not just a mixture of gases; it also contains solid and liquid particles. These include dust, pollen, bacteria, soot, ash, and salt crystals. These particulates can come from natural sources like volcanoes and fires, as well as from human activities Momber2007García2018. While some particulates are harmless or even beneficial, others can contribute to air pollution and negatively impact health and the environment .
Variability in Air Composition
The composition of air can change depending on location, altitude, weather, and human activities. For example, concentrations of water vapor, carbon dioxide, and pollutants can vary widely. Human activities, especially the burning of fossil fuels, have increased the levels of certain gases like carbon dioxide, leading to environmental issues such as global warming and smog Glueckauf1951Brimblecombe1986Gul2021.
Atmospheric Layers and Their Chemical Makeup
The atmosphere is divided into layers: the troposphere, stratosphere, mesosphere, thermosphere, and exosphere. Each layer has its own unique composition and characteristics. The stratosphere, for example, contains the ozone layer, which is crucial for absorbing harmful ultraviolet radiation Rohli2021Gul2021.
Conclusion
In summary, air is a complex mixture dominated by nitrogen and oxygen, with smaller amounts of argon, carbon dioxide, water vapor, and trace gases. It also contains various particulates. The exact composition can vary due to natural processes and human influence, and understanding these variations is important for environmental and health considerations Rusoke-Dierich2018Glueckauf1951Akhtar2007+5 MORE.
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