Picometre
From Wikipedia, the free encyclopedia
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 1×10−12 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 Ångström, an internationally recognized non-SI unit of length.
Symbol da h k M G T P E Z Y
Factor 100 101 102 103 106 109 1012 1015 1018 1021 1024
Symbol d c m µ n p f a z y
Factor 100 10−1 10−2 10−3 10−6 10−9 10−12 10−15 10−18 10−21 10−24
[edit] See also
Metric system Orders of magnitude (length) Conversion of units, for comparison with other units of length.
[edit] References
^ Elena Deza and Michel Marie Deza (2006). Dictionary of Distances. Elsevier. ISBN 0444520872. ^ 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
