Please Take Over This Page and Apply to be Editor-In-Chief for this topic: There can be one or more than one Editor-In-Chief. You may also apply to be an Associate Editor-In-Chief of one of the subtopics below. Please mail us  to indicate your interest in serving either as an Editor-In-Chief of the entire topic or as an Associate Editor-In-Chief for a subtopic. Please be sure to attach your CV and or biographical sketch.
A picometre (American spelling: picometer, symbol pm) is a unit of length in the metric system, equal to one millionth-millionth 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 or bicron.
It equals a hundredth of an Ångström, an internationally recognized non-SI unit of length.
- 1 E-12 m
- SI prefix
- Metric system
- Orders of magnitude (length)
- Conversion of units, for comparison with other units of length