Picometre


Picometre

Picometre

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Picometre

A Helium atom,
having a radius of 31 picometres.

A picometre (American spelling: picometer, symbol pm) is a unit of length in the metric system, equal to one trillionth (1/1,000,000,000,000) of a metre, which is the current SI base unit of length. It can be written in scientific notation as 1í—10−12 m (engineering notation) or 1 E-12 m (exponential notation) - both meaning 1 m / 1,000,000,000,000.

It equals a millionth of a micrometre (formerly called a micron), and was formerly called micromicron, stigma, or bicron.[1] The symbol µµ was once used for it.[2]

It equals a hundredth of an í…ngstrí¶m, an internationally recognized non-SI unit of length.

[] See also

[] References

  1. ^ Elena Deza and Michel Marie Deza (2006). Dictionary of Distances. Elsevier. ISBN 0444520872. 
  2. ^ How Many? A Dictionary of Units of Measurement; Russ Rowlett and the University of North Carolina at Chapel Hill; http://www.unc.edu/~rowlett/units/dictB.html
A Helium atom,
having a radius of 31 picometres.

A picometre (American spelling: picometer, symbol pm) is a unit of length in the metric system, equal to one trillionth (1/1,000,000,000,000) of a metre, which is the current SI base unit of length. It can be written in scientific notation as 1í—10−12 m (engineering notation) or 1 E-12 m (exponential notation) - both meaning 1 m / 1,000,000,000,000.

It equals a millionth of a micrometre (formerly called a micron), and was formerly called micromicron, stigma, or bicron.[1] The symbol µµ was once used for it.[2]

It equals a hundredth of an í…ngstrí¶m, an internationally recognized non-SI unit of length.

[] See also

[] References

  1. ^ Elena Deza and Michel Marie Deza (2006). Dictionary of Distances. Elsevier. ISBN 0444520872. 
  2. ^ How Many? A Dictionary of Units of Measurement; Russ Rowlett and the University of North Carolina at Chapel Hill; http://www.unc.edu/~rowlett/units/dictB.html