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A nanometre (American spelling: nanometer) is 10−9 metres—or one billionth of a meter. Its symbol is nm. It is an SI measure of length, commonly used in measuring the wavelengths of visible light, ultraviolet radiation and gamma rays; amongst other things.
1 nm = 1000 picometre.
1000 nm = 1 micrometre ( or 1 micron)
picometre << nanometre << micrometre
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