- Picometre
A picometre (American spelling: picometer, symbol pm) is a unit of
length in themetric system , equal to one trillionth (1/1,000,000,000,000) of ametre , which is the current SI base unit of length. It can be written inscientific notation as 1×10−12 m (engineering notation) or nowrap|1 E-12 m (exponential notation) — both meaning nowrap|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. [cite book | title = Dictionary of Distances | author = Elena Deza and Michel Marie Deza | publisher = Elsevier | year = 2006 | isbn = 0444520872 | url = http://books.google.com/books?id=I-PQH8gcOjUC&pg=PA347&dq=stigma+bicron&lr=&ei=tYjISJz5HaaktAPJkqjkBQ&sig=ACfU3U3U2S3gikmIt4r9RO8dM3GYllujSA ] The symbol µµ was once used for it. [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]It equals a hundredth of an
Ångström , an internationally recognized non-SI unit of length.ee also
*
Metric system
*Orders of magnitude (length)
*Conversion of units , for comparison with other units of length.References
Wikimedia Foundation. 2010.
