What percentage of normal air is composed of nitrogen?

Nitrogen constitutes approximately 78% of the composition of normal air. This significant percentage shows that nitrogen is the most abundant gas in the Earth's atmosphere, playing a vital role in various ecological and atmospheric processes.

The remaining components of air include oxygen, which makes up about 21%, and trace amounts of other gases such as carbon dioxide, argon, and others that only account for a small fraction of the atmosphere. Understanding the composition of air is essential in fields such as environmental science, meteorology, and aviation, where the properties of air and nitrogen's role are crucial.