Convert barn [b] to square mile (US survey) Online | Free area Converter
Barn [b]
A barn (b) is a very small unit of area used mainly in nuclear and particle physics to measure the cross-sectional area of atomic nuclei and particles.
1 barn = 10⁻²⁸ square meters (m²).
The name "barn" humorously refers to something “as big as a barn” in the tiny world of atomic scales, despite its extremely small size.
Square Mile (US Survey)
The square mile (US survey) is a unit of area used in the United States for land measurement based on the US survey foot. It represents a square with sides 1 mile long, where a mile is defined using the survey foot rather than the international foot.
1 US survey mile = 5,280 US survey feet
1 square mile (US survey) ≈ 2.589998 km² (slightly different from the international square mile of 2.59 km²)
This unit is mostly used in land surveying and mapping within the US.