The term "atmosphere" is often used to refer to the collection of gases that encircle the planet. It is necessary for all life and fulfils several functions, including supplying oxygen for breathing, absorbing harmful UV radiation, shielding the planet from falling asteroids, regulating climate, and maintaining the water cycle.
Nitrogen is the atmospheric gas that is most prevalent. Approximately 78 per cent of the atmosphere on Earth is nitrogen, 21 per cent is oxygen, 1 per cent is argon, and other gases like carbon dioxide and neon are present at negligible levels.
- Nitrogen
Colourless, odourless, and inert gas, nitrogen doesn't interact with other substances. This chemical element was initially identified in 1772 by chemist Daniel Rutherford. The most prevalent element and gas in the atmosphere are nitrogen and nitrogen dioxide.
All living thingscontain it. Nitrogen is a crucial component of protein, DNA, RNA, and amino acids. Nitrogen is essential for all living things' development, metabolism, and reproduction.
The primary sourceof nitrogen is the atmosphere. However, it cannot be directly used by plants or animals. Nitrogen is introduced to the soil through precipitation, animal excrement, and dead organic matter. Bacteria transform nitrogen in the soil into two forms that plants may use: ammonium and nitrate.
Creatures the nconsume plants and other animals to obtain nitrogen. Nitrogen will be released
back into the atmosphere due to more bacteria in the soil converting the ammonium and nitrate into di-nitrogen. The nitrogen cycle refers to the complete process.
- Oxygen
The second most prevalent gas in the atmosphere and the third most prevalent element in the
cosmos is oxygen. Carl-Wilhelm Scheele and Joseph Priestley made distinct discoveries in 1771 and 1774, respectively. Oxygen has no smell or colour and reacts strongly with other elements.
All living things need oxygen (O2) for respiration, and DNA molecules contain oxygen. Through
photosynthesis, plants can create oxygen and release it back into the atmosphere.
The Earth's atmosphere contains ozone (O3), a kind of oxygen. The Earth's surface is shielded from UV radiation by ozone, which deflects and absorbs dangerous rays.
- Argon
Argon is categorized as a noble gas because inert, colourless, and odourless. In 1894, Lord Rayleigh and Sir William Ramsay made the argon discovery. Even though it is the third most prevalent gas in the atmosphere, it is in hospitable to life. Argon is viewed as a straight forward asphyxiates. Large in halation doses may result in drowsiness, nausea, loss of judgment, asphyxia, and even death.
Due to its high inertness, argon is utilized in various applications, including incandescent light bulbs, shielding welds from oxidation, insulating spaces between glass panes, and occasionally replacing nitrogen.
- Additional Typical Gases and Elements
The three mostcommon elements in the atmosphere are nitrogen, oxygen, and argon. However,
more essential elements are needed to maintain life as we know it on Earth.
Gaseous carbondioxide is one of them. The Earth's atmosphere contains 0.04 per cent carbon dioxide. Carbon dioxide (CO2), composed of one carbon atom joined to two oxygen atoms, are an essential element in photosynthesis and other metabolic activities. Without CO2, autotrophs like plants and microorganisms that can synthesize chemical energy from light wouldn't be able to do so. This would mean that there would be no route for energy to enter the world's ecosystems, resulting in the extinction of life.
Another chemical that is essential for life is water or H2O. The atmosphere contains it in the
form of vapour.
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