Convert barn to square millimeter
Please provide values below to convert barn [b] to square millimeter [mm^2], or Convert square millimeter to barn.
How to Convert Barn to Square Millimeter
1 b = 1e-22 mm^2
Example: convert 15 b to mm^2:
15 b = 15 × 1e-22 mm^2 = 1.5e-21 mm^2
Barn to Square Millimeter Conversion Table
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Barn
A barn is a unit of area used primarily in agriculture to measure land, especially for farming purposes.
History/Origin
The barn originated as a unit of measure in the 19th century, based on the amount of land that could be covered by a barn, roughly equivalent to 40 square rods or about 40 acres, and was used in land surveying and farming contexts.
Current Use
Today, the barn is largely obsolete as a formal measurement unit but is still used colloquially in agriculture to refer to land area, especially in the United States, often informally approximating 40 acres.
Square Millimeter
A square millimeter (mm²) is a unit of area equal to the area of a square with sides measuring one millimeter.
History/Origin
The square millimeter has been used in scientific and engineering contexts for precise measurement of small areas, especially in fields like electronics and material science, as a subdivision of the metric system established in the 19th century.
Current Use
It is commonly used today in fields such as electronics, manufacturing, and scientific research to measure small surface areas, including the cross-sectional areas of wires and components.