Units of measurement
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Rood (rood)
Barn (b)
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Rood (rood)
A rood is an old British unit of area measurement, equal to 1/4 acre (1011.71 m²).
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.