Units of measurement
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Square rod (rd²)
Barn (b)
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Information
Square rod (rd²)
A square rod (rd²) is an old British unit of area, equal to 25.29 m² or 1/160 acre.
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.