Picometre

For examples of things measuring between one and ten picometres, see 1 picometre.
Picometre
A simplified representation of a helium atom, having an estimated (calculated) diameter of 62 picometres[1]
General information
Unit systemSI
Unit oflength
Symbolpm
Conversions
1 pm in ...... is equal to ...
   SI base units   1×10−12 m
   Natural units   6.1877×1022 ℓP
   1.8897×10−2 a0
   imperial/US units   3.9370×10−11 in
Look up picometre in Wiktionary, the free dictionary.

The picometre (international spelling as used by the International Bureau of Weights and Measures; SI symbol: pm) or picometer (American spelling) is a unit of length in the International System of Units (SI), equal to 1×10−12 m, or one trillionth (⁠1/1000000000000⁠) of a metre, which is the SI base unit of length.

The picometre is one thousand femtometres, one thousandth of a nanometre (⁠1/1000⁠ nm), one millionth of a micrometre (also known as a micron), one billionth of a millimetre, and one trillionth of a metre.[2] The symbol μμ was once used for it.[3] It is also one hundredth of an ångström, an internationally known (but non-SI) unit of length.

  1. ^ "Atomic radius". WebElements: the periodic table on the web.
  2. ^ Deza, Elena; Deza, Michel Marie (2006). Dictionary of Distances. Elsevier. ISBN 0-444-52087-2.
  3. ^ Rowlett, Russ (2018). "How Many? A Dictionary of Units of Measurement".