Convert Barns to Square Micrometers
Convert Barns (b) to Square Micrometers (μm²) instantly and accurately.
Conversion Formula
μm² = b × 1.000000000e-16
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 Micrometers
A square micrometer (μm²), also called a square micron, equals one trillionth of a square meter - the area of a square with sides one millionth of a meter (10⁻¹² m²). This is the natural scale of biological cells: a human red blood cell has a surface area of about 135 μm², and a typical bacterium might occupy 2-10 μm². Square micrometers are the standard unit in cell biology, histology, microscopy, and semiconductor characterisation where individual features on wafers are measured.
Quick Reference Table
| Barns (b) | Square Micrometers (μm²) |
|---|---|
| 1 b | 1 × 10-16 μm² |
| 2 b | 2 × 10-16 μm² |
| 5 b | 5 × 10-16 μm² |
| 10 b | 1 × 10-15 μm² |
| 25 b | 2.5 × 10-15 μm² |
| 50 b | 5 × 10-15 μm² |
| 100 b | 1 × 10-14 μm² |