What percentage of the Earth's atmosphere is composed of Nitrogen?

Nitrogen constitutes approximately 78% of the Earth's atmosphere, making it the most abundant gas present. This high percentage is significant for several reasons. Nitrogen plays a crucial role in the biosphere and is essential for plant growth, as it is a fundamental component of amino acids and nucleic acids. Its large presence in the atmosphere helps to dilute oxygen, which is necessary to prevent rapid combustion processes and support life.

The remaining percentages of the atmosphere are made up of oxygen (approximately 21%), argon (about 0.93%), and trace gases, which include carbon dioxide and others. Understanding these proportions is fundamental for various scientific and engineering disciplines, particularly in fields related to aviation and environmental science.