nanometre

The nanometre, or nanometer, is a unit of length in the International System of Units (SI), equal to one billionth or one thousand millionth 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 m.