picometre
/ˈpaɪkəˌmitər/
noun
- A unit of length equal to one trillionth of a meter (10⁻¹² meters), used in science to measure atoms and molecules. (British spelling of picometer.)
- The bond length between two carbon atoms is about 154 picometres.
- The radius of a proton is roughly 0.84 picometres.
- In chemistry class, we learned that a picometre is one millionth of a micrometre.