Concept

Nanometre

Summary
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 (0.000000001m) and to 1000 picometres. One nanometre can be expressed in scientific notation as 1e-9m, and as 1/{{val|1000000000}} metres. History The nanometre was formerly known as the "millimicrometre" – or, more commonly, the "millimicron" for short – since it is 1/1000 of a micrometre, and was often denoted by the symbol mμ or, more rarely, as μμ (which is confusing, since μμ should logically refer to a millionth of a micron). Etymology The name combines the SI prefix nano- (from the Ancient Greek νάνος, nanos, "dwarf") with the parent unit name metre (from Greek μέτρον, metrοn, "unit of measurement"). Usage Nanotechnologies are based on phenomena typic
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