The atmosphere contains approximately 21% oxygen by volume.
This means that out of every 100 parts of air, 21 parts are oxygen. This crucial gas supports life on Earth by enabling respiration in most organisms. While nitrogen makes up the bulk of the atmosphere, oxygen's presence at 21% is essential.
Here's a breakdown of the major components of the Earth's atmosphere by volume:
| Component | Percentage |
|---|---|
| Nitrogen (N2) | 78% |
| Oxygen (O2) | 21% |
| Argon (Ar) | 0.93% |
| Other Gases | ~0.07% |
The 21% oxygen level is a delicate balance, and changes to this percentage could have significant impacts on the planet and its inhabitants. The reference confirms that oxygen constitutes 21% of the atmosphere's total volume. This data is crucial for understanding the basic composition of the air we breathe and the factors that impact it.
