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Which gas is most abundant in the Earth's atmosphere?
Oxygen
Carbon Dioxide
Nitrogen
Hydrogen
Nitrogen
Nitrogen is the most abundant gas in the Earth's atmosphere, accounting for approximately 78% of its total volume. Oxygen follows as the second most abundant gas at about 21%, while other gases like argon and carbon dioxide comprise the remaining fraction.
Nitrogen is the most abundant gas in the Earth's atmosphere, accounting for approximately 78% of its total volume. Oxygen follows as the second most abundant gas at about 21%, while other gases like argon and carbon dioxide comprise the remaining fraction.
Imagine a classroom of 100 students where 78 students wear blue shirts (nitrogen), 21 wear red shirts (oxygen), and 1 student wears a green shirt representing all other trace gases combined.
NOA тАФ Nitrogen, Oxygen, Argon (the top three atmospheric gases in decreasing order of abundance).
N2тАЛ тАФ Molecular formula for nitrogen gas
O2тАЛ тАФ Molecular formula for oxygen gas
The current composition of Earth's atmosphere developed through volcanic outgassing and long-term biogeochemical cycles. Molecular nitrogen (N2тАЛ) is relatively inert and stable under standard atmospheric conditions, preventing it from easily reacting with surface materials and allowing it to accumulate over geological timescales.
Nitrogen makes up roughly 78% of the Earth's atmosphere by volume.
Oxygen accounts for approximately 21% of the atmosphere.
Argon is the third most abundant gas at roughly 0.93%.
Industrial production of ammonia via the Haber process using atmospheric nitrogen.
Providing an inert atmosphere for food packaging and chemical processing to prevent oxidation.
Option A (Oxygen) is incorrect because it is the second most abundant gas (21%).
Option B (Carbon Dioxide) is a trace gas making up only about 0.04% of the atmosphere.
Option D (Hydrogen) is extremely light and escapes Earth's gravitational pull into space, leaving only trace amounts in the homosphere.
C is correct тАФ Nitrogen is the most abundant gas in the Earth's atmosphere, comprising about 78% by volume.
Memorize the exact percentage breakdown of the top three atmospheric gases (Nitrogen 78%, Oxygen 21\, Argon 0.93%) as they are frequently tested in RRB and general science exams.