Convert Barns to Square Kilometers
Convert Barns (b) to Square Kilometers (km²) instantly and accurately.
Conversion Formula
km² = b × 1.000000000e-34
About Barns
A barn (b) is a unit of area used in nuclear and particle physics to measure effective cross-sections of atomic nuclei and particle interaction probabilities. Equal to 10⁻²⁸ m² (10⁻²⁴ cm²), it was humorously named during the Manhattan Project - physicists joked that uranium nuclei were 'as big as a barn' at the subatomic scale. Particle physics experiments at accelerators like CERN report cross-sections in millibarns (mb), microbarns (μb), nanobarns (nb), and femtobarns (fb).
About Square Kilometers
A square kilometer (km²) is a metric unit of area equal to a square with sides of one kilometer (1,000 m × 1,000 m). It is used for measuring large land areas such as cities, forests, lakes, and countries. Manhattan (New York) is about 59 km², and Monaco (the second smallest country) is just over 2 km². This unit is essential in geography, urban planning, forestry, and environmental impact studies.
Quick Reference Table
| Barns (b) | Square Kilometers (km²) |
|---|---|
| 1 b | 1 × 10-34 km² |
| 2 b | 2 × 10-34 km² |
| 5 b | 5 × 10-34 km² |
| 10 b | 1 × 10-33 km² |
| 25 b | 2.5 × 10-33 km² |
| 50 b | 5 × 10-33 km² |
| 100 b | 1 × 10-32 km² |