Convert Square Attometer to Are
Convert square attometers to ares instantly. 1 square attometer = 1e-38 are — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Are to Square Attometer converter for the reverse conversion.
Units explained
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.
Are
An are is a metric unit of area equal to 100 square meters. It is used in some European countries for land measurement, especially for smaller plots like vineyards and gardens.
Introduced as part of the French metric system in 1795. The name comes from the Latin 'area' meaning surface or open ground.
Ares are still used in some European countries (especially Switzerland and France) for small-plot land measurement. In Switzerland, an are is a common unit for vineyard size. Most modern contexts prefer square meters or hectares.
Defined in 1795 in France as part of the original metric system.
Square Attometer to Are conversion formula
The relationship between square attometers and ares:
To convert square attometers to ares, multiply the value in square attometers by 1e-38. To reverse, multiply ares by 1e+38.
How to use this converter
Type a value into the calculator. The result in ares updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Are to Square Attometer converter for the reverse direction.
Step-by-step: convert square attometers to ares
- Write down the value in square attometers (am²).
- Multiply that value by the factor 1e-38.
- The product is the equivalent value in ares (a).
- To reverse, multiply the are value by 1e+38.
Worked examples
Example 1 — Convert 1 am² to a:
1 × 1e-38 = 1e-38 a
Example 2 — Convert 100 am² to a:
100 × 1e-38 = 1e-36 a
Real-world example — Molecular dimensions
The diameter of small molecular structures (around 2 square attometers) is often converted into related sub-micron units when comparing measurements across different microscopy techniques or imaging modalities.
2 am² × 1e-38 = 2e-38 a
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 attometers can be re-expressed in ares for direct comparison with another instrument's calibration data sheet.
800 am² × 1e-38 = 8e-36 a
Square Attometer to Are conversion table
Standard reference values for converting square attometers to ares:
| Square Attometer [am²] | Are [a] |
|---|---|
| 0.01 | 1e-40 |
| 0.1 | 1e-39 |
| 1 | 1e-38 |
| 2 | 2e-38 |
| 3 | 3e-38 |
| 4 | 4e-38 |
| 5 | 5e-38 |
| 10 | 1e-37 |
| 20 | 2e-37 |
| 30 | 3e-37 |
| 40 | 4e-37 |
| 50 | 5e-37 |
| 100 | 1e-36 |
| 500 | 5e-36 |
| 1000 | 1e-35 |
Frequently asked questions
How many ares is 1 square attometer?
How do I convert square attometers to ares?
How do I convert ares back to square attometers?
How many ares is 100 square attometers?
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Metric / SI (15 units)
Imperial / US Customary (3 units)
Sources & references
Conversion factor (1 am² = 1e-38 a) 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.