Convert Square Micrometers to Barns
Convert Square Micrometers (μm²) to Barns (b) instantly and accurately.
Conversion Formula
b = μm² × 1.000000000e+16
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.
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).
Quick Reference Table
| Square Micrometers (μm²) | Barns (b) |
|---|---|
| 1 μm² | 1 × 1016 b |
| 2 μm² | 2 × 1016 b |
| 5 μm² | 5 × 1016 b |
| 10 μm² | 1 × 1017 b |
| 25 μm² | 2.5 × 1017 b |
| 50 μm² | 5 × 1017 b |
| 100 μm² | 1 × 1018 b |