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A barn (symbol: b) is a metric unit of area equal to 10 −28 m 2 (100 fm 2). This is equivalent to a square that is 10 −14 m (10 fm ) each side, or a circle of diameter approximately 1.128 × 10 −14 m (11.28 fm).
Similar to the barn-megaparsec, the Hubble-barn uses the barn with the Hubble length, which is the radius of the visible universe as derived by using the Hubble constant and the speed of light. This amounts to around 13.1 litres (3.46 US gallons, 2.88 Imperial gallons).
The shed is a unit of area used in nuclear physics equal to 10 −24 barns (100 rm 2 = 10 −52 m 2). The outhouse is a unit of area used in nuclear physics equal to 10 −6 barns (100 am 2 = 10 −34 m 2). The barn (b) is a unit of area used in nuclear physics equal to one hundred femtometres squared (100 fm 2 = 10 −28 m 2).
This was an official unit of measurement in South Africa until the 1970s, and was defined in November 2007 by the South African Law Society as having a conversion factor of 1 morgen = 0.856 532 hectares. [28] This unit of measure was also used in the Dutch colonial province of New Netherland (later New York and parts of New England). [29] [30]
While not a new phenomenon, barn conversion became quite popular in the waning years of the 20th century. Changing a barn over from its historic agricultural use to residential use generally requires significant changes in the integrity of the barn and if the structure is of historic value these alterations rarely preserve the historic character of the barn. [1]
Nuclear cross sections are used in determining the nuclear reaction rate, and are governed by the reaction rate equation for a particular set of particles (usually viewed as a "beam and target" thought experiment where one particle or nucleus is the "target", which is typically at rest, and the other is treated as a "beam", which is a projectile with a given energy).
Conversions between units in the metric system are defined by their prefixes (for example, 1 kilogram = 1000 grams, 1 milligram = 0.001 grams) and are thus not listed in this article. Exceptions are made if the unit is commonly known by another name (for example, 1 micron = 10 −6 metre).
The National Institute of Standards and Technology formerly contended that customary area units are defined in terms of the square survey foot, not the square international foot, [17] but from 2023 it states that "although historically defined using the U.S. survey foot, the statute mile can be defined using either definition of the foot, as is ...