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or one thousand millionth (long 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  m.

History

The nanometre was formerly known as the "millimicrometre" - or, more commonly, the "millimicron" for short - since it is of a micrometre. It was often denoted by the

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