Picometre
The picometre (international spelling as used by the International Bureau of Weights and Measures; SI symbol: pm) or picometer (American spelling) is a unit of length in the International System of Units (SI), equal to 1×10−12 m, or one trillionth (1/1000000000000) of a metre, which is the SI base unit of length.
| Picometre | |
|---|---|
A simplified representation of a helium atom, having an estimated (calculated) diameter of 62 picometres | |
| General information | |
| Unit system | SI |
| Unit of | length |
| Symbol | pm |
| Conversions | |
| 1 pm in ... | ... is equal to ... |
| SI base units | 1×10−12 m |
| Natural units | 6.1877×1022 ℓP 1.8897×10−2 a0 |
| imperial/US units | 3.9370×10−11 in |
Look up picometre in Wiktionary, the free dictionary.
The picometre is one thousand femtometres, one thousandth of a nanometre (1/1000 nm), one millionth of a micrometre (also known as a micron), one billionth of a millimetre, and one trillionth of a metre. The symbol μμ was once used for it. It is also one hundredth of an ångström, an internationally known (but non-SI) unit of length.
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