Estimate
A randomly chosen dry-air particle is nitrogen
- Probability:
- 78.1%
- Odds:
- 3.6 to 1
- dBan
- +5.5 dBan
By particle count, nitrogen molecules make up about 78% of the representative dry-air sample.
Calculation
p ≈ 0.7808 by particle count
Assumptions
Under an ideal-gas model, the published dry-air volume fraction equals the particle fraction. Local composition varies.
Sources
- NASA Earth Fact Sheet composition updated 15 November 2024