What percentage of air is composed of nitrogen?

The correct answer is that 78% of the air is composed of nitrogen. In the Earth's atmosphere, nitrogen is the most abundant gas, making up a significant portion of the air we breathe. This high percentage is essential for various natural processes, including supporting life and influencing weather patterns.

Understanding the composition of air is critical, especially in medical settings where gases are utilized for therapies and diagnostics. Recognizing the dominant presence of nitrogen can also impact how we manage and administer medical gases, as nitrogen is used in several applications, including as an inert gas in certain medical procedures.