# Distances shorter than 1 pm

(Redirected from 1 femtometre)

To help compare different orders of magnitude this page lists lengths shorter than 10−12 metres (1 pm).

This series on orders of magnitude does not have a range of shorter distances

## Shorter than 1 ym

• 1.62 × 10−35 metres = the Planck length (lengths smaller than this do not make any physical sense, according to current theories of physics)

## 1 ym to 1 zm

• 1 × 10−24 metres = 1 ym = 1 yoctometre, the smallest named subdivision of the metre in the SI base unit of length.
• 1 × 10−23 metres = 10 ym
• 1 × 10−22 metres = 100 ym

## 1 zm to 1 am

• 7 × 10−21 metres = radius of effective cross section for a 250 GeV neutrino scattering off a nucleon2
• 1 × 10−20 metres = 10 zm
• 1 × 10−19 metres = 100 zm

## 1 am to 1 fm

• 1 × 10−17 metres = 10 am
• 1 × 10−16 metres = 100 am
• 0.85 fm — approximate proton radius3

## 1 fm to 1 pm

• 1 × 10−14 metres = 10 fm
• 1 × 10−13 metres = 100 fm

Distances longer than 1 pm

## References

1. ^ Carl R. Nave. "Cowan and Reines Neutrino Experiment". Retrieved 2008-12-04. (6.3 x 10−44 cm2, which gives an effective radius of about 2 x 10−23 m)
2. ^ a b Carl R. Nave. "Neutron Absorption Cross-sections". Retrieved 2008-12-04. (area for 20 GeV about 10 x 10−42 m2 gives effective radius of about 2 x 10−21 m; for 250 GeV about 150 x 10−42 m2 gives effective radius of about 7 x 10−21 m)
3. ^ Randolf Pohl, Aldo Antognini, François Nez, Fernando D. Amaro, François Biraben, João M. R. Cardoso, Daniel S. Covita, Andreas Dax, Satish Dhawan, Luis M. P. Fernandes, Adolf Giesen, Thomas Graf, Theodor W. Hänsch, Paul Indelicato, Lucile Julien, Cheng-Yang Kao, Paul Knowles, Eric-Olivier Le Bigot, Yi-Wei Liu, José A. M. Lopes, Livia Ludhova, Cristina M. B. Monteiro, Françoise Mulhauser, Tobias Nebel, Paul Rabinowitz, et al. (8 July 2010). "The size of the proton". Nature 466 (7303): 213–216. Bibcode:2010Natur.466..213P. doi:10.1038/nature09250. PMID 20613837. Retrieved 2010-07-09.
4. ^ a b Carl R. Nave. "Scattering Cross Section". Retrieved 2009-02-10.
5. ^ NIST. CODATA Value: classical electron radius. Retrieved 2009-02-10

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