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barn
Symbol:  b 
Category:  Area 
SI Equivalent:  1×10-28 m2
Dimension L2 
 
Notes
In 1942, H. G. Holloway and C. P. Baker introduced this unit to describe certain phenomena in nuclear physics such as fission, capture, diffusion, and absorption of nuclides.
Convert     b  
1 b =
Area
  Symbol Unit Name
2.47105×10-32  ac, acre  acre 
1×10-30  a  are 
2.55618×10-28  bbl (US, liq.)/ft  barrel (US, liq.) per foot 
2.13015×10-29  bbl (US, liq.)/in  barrel (US, liq.) per inch 
1.91713×10-28  bbl (US, petrol)/ft  barrel (US, petrol) per foot 
1.59761×10-29  bbl (US, petrol)/in  barrel (US, petrol) per inch 
1×10-28    centare 
1.97353×10-25  cin  circular inch 
1.97353×10-19  cmil  circular mil 
1×10-32  ha  hectare 
1.21295×10-32    morgen (Dutch) 
3.94907×10-32    morgen (Prussian) 
1.1675×10-32    morgen (South Africa) 
1.54441×10-34    quarter section 
9.88422×10-32    rood (UK) 
3.86102×10-35  sq.mi, mi2 (stat.)  section (square statute mile) 
1×1024    shed 
1×10-24  cm2  square centimeter 
1.07639×10-31  sq. ch. (engineer's)  square chain (engineer's) 
2.47105×10-31  sq. ch. (Gunter's)  square chain (Gunter's) 
1×10-30  dam2  square decameter 
1×10-26  dm2  square decimeter 
1×10-64  Em2  square exameter 
100  fm2  square femtometer 
100  f2  square fermi 
1.07639×10-27  ft2  square foot 
1×10-46  Gm2  square gigameter 
1×10-32  hm2  square hectometer 
1.55×10-25  in2, sq. in  square inch 
1×10-34  km2  square kilometer 
1×10-40  Mm2  square megameter 
1×10-28  m2  square meter 
1×10-16  ┬Ám2  square micrometer 
1.55×10-19  mil2  square mil (thou) 
1.81554×10-36  sq. mi. (geogr.)  square mile (geographical) 
2.91553×10-35  sq. mi. (int. naut.)  square mile (int. naut.) 
3.86101×10-35  sq. mi. (int.)  square mile (int.) 
1×10-22  mm2  square millimeter 
10×10-11  nm2  square nanometer 
3.95366×10-30  rd2  square perch 
10×10-59  Pm2  square petameter 
10×10-5  pm2  square picometer 
3.95366×10-30  rd2  square pole 
3.95366×10-30  rd2  square rod 
10×10-53  Tm2  square terameter 
1.19599×10-28  yd2, sq. yd  square yard 
1×1020  ym2  square yoctometer 
2.93874×10-67  Ym2  square yottameter 
9.99473×1013  zm2  square zeptometer 
2.93874×10-67  Zm2  square zettameter 
1.07251×10-36    township (US) 
5.55987×10-32    vergee (Jersey) 
6.48652×10-32    vergees (Guernsey) 
Fuel Consumption
  Symbol Unit Name
4.25144×10-23  gal/mile  gallon per mile 
1×10-20  l/100 km  liter per 100 kilometers 
1×10-22  l/km  liter per kilometer 
Hydrodynamic permeability
  Symbol Unit Name
1.01325×10-16    darcy 
Glossary