Units of measurement
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Calculations
Square kilometer (km²)
Barn (b)
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Square kilometer (km²)
A square kilometer (km²) is used for measuring large areas, such as cities, forests, and countries. One km² equals 1,000,000 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.