100 picometres
100 pmLength · definition
The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.
Length & distance
Just how long is 100 picometres?
Microscopic
100 pm
100 picometres
The quantity is exact as entered.
100 pmLength
0 - shared origin
Hydrogen atom
A hydrogen atom is the simplest neutral atom, with one proton in its nucleus and one electron around it.
105.8 pmCharacteristic size
0 - shared origin
Both rulers start at the same zero and share one linear scale. Artwork keeps its original proportions. A ruler represents the selected distance or a measurement not visible in this view.
A little perspective
The characteristic size of a hydrogen atom is about 1.06 times 100 picometres.
Measurements, assumptions & sources +
100 picometres
Length: 100 pm; definition.
The quantity is exact as entered. Comparisons use the clearly stated specimen, model or nominal measurement.
Hydrogen atom
Characteristic size: 105.8 pm; representative.
A diameter of twice the Bohr radius, used as a characteristic scale. An electron cloud has no hard outer surface.
NIST — 2022 CODATA fundamental constants
The marked characteristic size is calibrated. Unmeasured illustration details are representative.
Measurement details
Why these numbers?
Compare 100 picometres with the characteristic size of a hydrogen atom. The notes below explain how each value was chosen.
Hydrogen atom
105.8 pmCharacteristic size · representative
A diameter of twice the Bohr radius, used as a characteristic scale. An electron cloud has no hard outer surface.
- Comparing
- Length ↔ Characteristic size
- Relative size
- The characteristic size of a hydrogen atom is about 1.06 times 100 picometres. The characteristic size of a hydrogen atom is approximately 5.84% greater than 100 picometres.
How to read the visual
The diagram uses the recorded measurements. Details outside the marked spans do not set the scale.
- The characteristic size of a hydrogen atom: This is a representative comparison value; individual specimens or conditions can vary.
This comparison follows the selected length only; other dimensions may differ.
1 × 10⁻¹⁰ mmetres
3.2808 × 10⁻¹⁰ ftfeet
6.2137 × 10⁻¹⁴ mimiles
6.6846 × 10⁻²² AUastronomical units
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