Units of measurement
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Are (a)
Barn (b)
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Information
Are (a)
An are (a) is a unit of area measurement equal to 100 m² (10×10 m). It is used in agriculture and cadastral measurements.
Barn (b)
A barn (b) is a unit of area measurement used in nuclear physics to describe atomic nucleus cross-sections. 1 barn = 10⁻²⁸ m².