Convert Square Centimeter to Barn
Convert square centimeters to barns instantly. 1 square centimeter = 1e+24 barn — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Barn to Square Centimeter converter for the reverse conversion.
Units explained
Square Centimeter
A square centimeter is a metric unit of area equal to 10⁻⁴ m² (1 cm × 1 cm). It is widely used in everyday measurement, lab work, and small-area applications.
Derived by squaring the centimeter (1/100 of a meter). The centi- prefix comes from the Latin 'centum' (hundred).
Square centimeters express the cross-sectional area of pipes and cables, the surface area of small everyday objects, biological tissue samples, and many engineering quantities. The SI unit for medical/pharmaceutical dose-per-area is often expressed in cm².
Centimeter has been part of the metric system since 1795.
Barn
A barn is a scientific unit of area equal to exactly 10⁻²⁸ m² (100 fm²). It is used in nuclear and particle physics to express interaction cross-sections.
Named in 1942 at Purdue University by physicists working on the Manhattan Project. The name comes from the phrase 'big as a barn' — uranium nuclei have cross-sections this large, which physicists initially considered surprisingly large for nuclear targets.
Barns and their submultiples (millibarn, microbarn, nanobarn, picobarn, femtobarn) are the standard units for cross-section measurements in nuclear physics, high-energy physics, and accelerator experiments. The Higgs boson production cross-section at the LHC is in the picobarn range.
Named in 1942 during the Manhattan Project; adopted internationally in particle physics.
Square Centimeter to Barn conversion formula
The relationship between square centimeters and barns:
To convert square centimeters to barns, multiply the value in square centimeters by 1e+24. To reverse, multiply barns by 1e-24.
How to use this converter
Type a value into the calculator. The result in barns updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Barn to Square Centimeter converter for the reverse direction.
Step-by-step: convert square centimeters to barns
- Write down the value in square centimeters (cm²).
- Multiply that value by the factor 1e+24.
- The product is the equivalent value in barns (b).
- To reverse, multiply the barn value by 1e-24.
Worked examples
Example 1 — Convert 1 cm² to b:
1 × 1e+24 = 1e+24 b
Example 2 — Convert 100 cm² to b:
100 × 1e+24 = 1e+26 b
Real-world example — Mid-micron to nanometer
3 square centimeters equals 3,000 barns — useful when relating mid-infrared wavelengths (typically quoted in microns) to nanometer-scale visible-light wavelength tables.
3 cm² × 1e+24 = 3e+24 b
Real-world example — From microns to sub-micron features
One square centimeter equals one thousand barns — the conversion semiconductor designers do constantly when comparing mask feature dimensions to actual transistor gate lengths.
1 cm² × 1e+24 = 1e+24 b
Real-world example — Infrared to visible-spectrum mapping
A 10-square centimeter thermal infrared wavelength corresponds to a much larger number in barns, the unit favoured for ultraviolet and visible-light specifications.
10 cm² × 1e+24 = 1e+25 b
Square Centimeter to Barn conversion table
Standard reference values for converting square centimeters to barns:
| Square Centimeter [cm²] | Barn [b] |
|---|---|
| 0.01 | 1e+22 |
| 0.1 | 1e+23 |
| 1 | 1e+24 |
| 2 | 2e+24 |
| 3 | 3e+24 |
| 4 | 4e+24 |
| 5 | 5e+24 |
| 10 | 1e+25 |
| 20 | 2e+25 |
| 30 | 3e+25 |
| 40 | 4e+25 |
| 50 | 5e+25 |
| 100 | 1e+26 |
| 500 | 5e+26 |
| 1000 | 1e+27 |
Frequently asked questions
How many barns is 1 square centimeter?
How do I convert square centimeters to barns?
How do I convert barns back to square centimeters?
How many barns is 100 square centimeters?
Popular area unit conversions
Convert Square Centimeter to other area units
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Metric / SI (15 units)
Imperial / US Customary (15 units)
US Survey (5 units)
Indian Subcontinent (16 units)
Other Regional (10 units)
Scientific / Physics (5 units)
Sources & references
Conversion factor (1 cm² = 1e+24 b) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.