Convert Square Picometer to Square Attometer
Convert square picometers to square attometers instantly. 1 square picometer = 1e+12 square attometer — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Square Attometer to Square Picometer converter for the reverse conversion.
Units explained
Square Picometer
A square picometer is a metric unit of area equal to 10⁻²⁴ m². It is used at atomic and molecular scales.
Derived by squaring the picometer (10⁻¹² m). The pico- prefix comes from the Italian 'piccolo' (small).
Square picometers appear in computational chemistry, surface science, and X-ray crystallography when discussing atomic cross-sections and very small surface patches.
SI prefix pico- adopted in 1960.
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 Picometer to Square Attometer conversion formula
The relationship between square picometers and square attometers:
To convert square picometers to square attometers, multiply the value in square picometers by 1e+12. To reverse, multiply square attometers by 1e-12.
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 Picometer converter for the reverse direction.
Step-by-step: convert square picometers to square attometers
- Write down the value in square picometers (pm²).
- Multiply that value by the factor 1e+12.
- The product is the equivalent value in square attometers (am²).
- To reverse, multiply the square attometer value by 1e-12.
Worked examples
Example 1 — Convert 1 pm² to am²:
1 × 1e+12 = 1e+12 am²
Example 2 — Convert 100 pm² to am²:
100 × 1e+12 = 1e+14 am²
Real-world example — Molecular dimensions
The diameter of small molecular structures (around 2 square picometers) is often converted into related sub-micron units when comparing measurements across different microscopy techniques or imaging modalities.
2 pm² × 1e+12 = 2e+12 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 picometers can be re-expressed in square attometers for direct comparison with another instrument's calibration data sheet.
800 pm² × 1e+12 = 8e+14 am²
Square Picometer to Square Attometer conversion table
Standard reference values for converting square picometers to square attometers:
| Square Picometer [pm²] | Square Attometer [am²] |
|---|---|
| 0.01 | 1e+10 |
| 0.1 | 1e+11 |
| 1 | 1e+12 |
| 2 | 2e+12 |
| 3 | 3e+12 |
| 4 | 4e+12 |
| 5 | 5e+12 |
| 10 | 1e+13 |
| 20 | 2e+13 |
| 30 | 3e+13 |
| 40 | 4e+13 |
| 50 | 5e+13 |
| 100 | 1e+14 |
| 500 | 5e+14 |
| 1000 | 1e+15 |
Frequently asked questions
How many square attometers is 1 square picometer?
How do I convert square picometers to square attometers?
How do I convert square attometers back to square picometers?
How many square attometers is 100 square picometers?
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Metric / SI (15 units)
Imperial / US Customary (3 units)
Sources & references
Conversion factor (1 pm² = 1e+12 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.