Convert Square Femtometer to Square Attometer
Convert square femtometers to square attometers instantly. 1 square femtometer = 1000000.0000000001 square attometer — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square Attometer to Square Femtometer converter for the reverse conversion.
Units explained
Square Femtometer
A square femtometer is a metric unit of area equal to 10⁻³⁰ m². It is used in nuclear and particle physics to describe interaction cross-sections at the nuclear scale.
Derived by squaring the femtometer (10⁻¹⁵ m), historically known as the fermi after physicist Enrico Fermi.
Square femtometers are equivalent to 0.01 barn. They appear in particle physics literature comparing strong interaction cross-sections and hadron sizes.
Femtometer adopted into SI in 1964; the fermi nomenclature predates this from mid-20th century nuclear physics.
Square Attometer
A square attometer is a metric unit of area equal to 10⁻³⁶ m². It is used in theoretical particle physics when discussing cross-sections at the sub-femtometer scale.
Derived by squaring the attometer (10⁻¹⁸ m). The atto- prefix was adopted by the CGPM in 1964 from the Danish 'atten' (eighteen), denoting 10⁻¹⁸.
Square attometers can appear in particle physics literature comparing extremely small interaction cross-sections, though more often barns (10⁻²⁸ m²) are used at this scale.
SI prefix atto- adopted in 1964; remains a defined unit, rarely used in practice.
Square Femtometer to Square Attometer conversion formula
The relationship between square femtometers and square attometers:
To convert square femtometers to square attometers, multiply the value in square femtometers by 1000000.0000000001. To reverse, multiply square attometers by 1e-6.
How to use this converter
Type a value into the calculator. The result in square attometers updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Square Attometer to Square Femtometer converter for the reverse direction.
Step-by-step: convert square femtometers to square attometers
- Write down the value in square femtometers (fm²).
- Multiply that value by the factor 1000000.0000000001.
- The product is the equivalent value in square attometers (am²).
- To reverse, multiply the square attometer value by 1e-6.
Worked examples
Example 1 — Convert 1 fm² to am²:
1 × 1000000.0000000001 = 1000000.0000000001 am²
Example 2 — Convert 100 fm² to am²:
100 × 1000000.0000000001 = 1e+8 am²
Real-world example — Molecular dimensions
The diameter of small molecular structures (around 2 square femtometers) is often converted into related sub-micron units when comparing measurements across different microscopy techniques or imaging modalities.
2 fm² × 1000000.0000000001 = 2000000.0000000002 am²
Real-world example — Wavelengths across the spectrum
Optical and atomic-scale phenomena are routinely cross-converted between sub-micron units. A photon of wavelength 800 square femtometers can be re-expressed in square attometers for direct comparison with another instrument's calibration data sheet.
800 fm² × 1000000.0000000001 = 8e+8 am²
Square Femtometer to Square Attometer conversion table
Standard reference values for converting square femtometers to square attometers:
| Square Femtometer [fm²] | Square Attometer [am²] |
|---|---|
| 0.01 | 10000 |
| 0.1 | 100000 |
| 1 | 1000000.0000000001 |
| 2 | 2000000.0000000002 |
| 3 | 3000000.0000000005 |
| 4 | 4000000.0000000005 |
| 5 | 5000000.0000000009 |
| 10 | 1e+7 |
| 20 | 2e+7 |
| 30 | 3e+7 |
| 40 | 4e+7 |
| 50 | 5e+7 |
| 100 | 1e+8 |
| 500 | 5e+8 |
| 1000 | 1e+9 |
Frequently asked questions
How many square attometers is 1 square femtometer?
How do I convert square femtometers to square attometers?
How do I convert square attometers back to square femtometers?
How many square attometers is 100 square femtometers?
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Metric / SI (15 units)
Imperial / US Customary (3 units)
Sources & references
Conversion factor (1 fm² = 1000000.0000000001 am²) 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.