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
- ^ 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
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
- ^ 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