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"1 pm" redirects here. For the time, see 12-hour clock.
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- 1 pm = 1 picometre = 1,000 femtometres
- 1 pm = distance between atomic nuclei in a white dwarf star
- 2.4 pm — The Compton wavelength of the electron.
- 5 pm — shorter X-ray wavelengths (approx.)