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Convert Dunam to Barn (du to b) instantly with accurate, readable results.
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Dunam (donum; dönüm) - regional land area
Dunam is a regional metric land unit widely used in the Middle East, most commonly defined today as 1,000 square meters. Used in agriculture, real estate, and land records; note that historical values vary by country.
- Names/aliases: dunam, donum, dönüm; often equated with the decare
- System: Metric (non-SI, regional)
- Exact (modern metric): 1 dunam = 1,000 m² = 0.1 ha ≈ 0.247105381 acres
- Regional variants (historical/legal): Cyprus donum ≈ 1,338 m²; Iraq dunam = 2,500 m²; older Ottoman-era values ranged ~900–1,600 m²
- Typical examples: farm plots and urban parcels listed in dunams; planning and zoning documents across Israel, Palestine, Jordan, Lebanon, Turkey (usage/name varies)
Barn (b) - nuclear/particle cross-section area
Barn is a non-SI unit of area used in nuclear and particle physics to express interaction cross-sections. The name originated humorously during the Manhattan Project (“as big as a barn”).
- Symbol: b
- System: Non-SI (accepted in high-energy/nuclear physics)
- Exact relations: 1 b = 10⁻²⁸ m² = 10⁻²⁴ cm² = 100 fm²
- Common submultiples: 1 mb = 10⁻³ b; 1 µb = 10⁻⁶ b; 1 nb = 10⁻⁹ b; 1 pb = 10⁻¹² b; 1 fb = 10⁻¹⁵ b; 1 ab = 10⁻¹⁸ b
- Related usage: integrated luminosity often quoted in inverse barns (e.g., fb⁻¹)
- Typical examples: neutron capture and scattering cross-sections; collider process cross-sections reported from barns down to picobarns and femtobarns