Area units calculator & converter tool
Barn Conversions Table
Equivalent of 4 Barn: |
0.004 m2 (Square meter) |
40 cm2 (Square centimeter) |
0.4 dm2 (Square decimeter) |
4000 mm2 (Square milimeter) |
4.0E-9 km2 (Square Kilometer) |
4.0E-7 Hectare |
4.0E-5 Are |
4.0E-6 Decare |
0.004 Centiare |
1.17002E-6 Arpent |
0.0430556 Square feet |
9.8842E-7 Acre |
0.0001581476 Square perche |
1.5444E-9 Square mil |
0.00478396 Square yard |
6.200018510385 Square inch |
4.292E-11 Canton |
6.176E-9 Homestead |
3.9536E-6 Rood |
Barn / Yard2 Units Definition
Barn
A barn (symbol: b) is a metric unit of area equal to 10-28 m2 (100 fm2). Originally used in nuclear physics to express the cross section of nuclei and nuclear reactions, it is also used today in all areas of high energy physics to express the cross sections of any diffusion process, and is best understood as a measure of the probability of interaction between small particles. A barn corresponds approximately to the cross section of a uranium nucleus. The barn is also the unit of area used in nuclear quadrupole resonance and nuclear magnetic resonance to quantify the interaction of a nucleus with an electric field gradient. Although the barn was never an SI unit, the SI standards body recognized it in the 8th SI brochure (replaced 2019) due to its use in particle physics.
Square yard
Square yard is area unit, symbol: [sq yd]. Definition of 1 square yard ≡ 1 yd × 1 yd. Square yard (International) area is equal with 1 yard by 1 yard square ≡ 0.9144 × 0.9144 ≡ 0.83612736 m². Compared to square metre, square yard is smaller unit.