Units of measurement
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Square meter (m²)
Barn (b)
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Square meter (m²)
A square meter (m²) is the primary unit of area measurement in the International System of Units (SI). It is used for measuring room sizes, land plots, etc.
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.