# Nanometre

## Unit of length / From Wikipedia, the free encyclopedia

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The **nanometre** (international spelling as used by the International Bureau of Weights and Measures; SI symbol: **nm**) or **nanometer** (American spelling) is a unit of length in the International System of Units (SI), equal to one billionth (short scale) of a metre (0.000000001 m) and to 1000 picometres. One nanometre can be expressed in scientific notation as 1×10^{−9} m, and as 1/1000000000 metres.