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Units of
nanometer
A nanometer (nm) is an SI unit of length applying the nano‑ prefix (10^-9). One nanometer equals 1e-09 meters. The nano prefix denotes a factor of 10^-9, so 1 nanometer equals 10^-9 metres. Such very small magnitudes are primarily encountered in nanotechnology and materials science.
picometer
A picometer (pm) is an SI unit of length applying the pico‑ prefix (10^-12). One picometer equals 1e-12 meters. The pico prefix denotes a factor of 10^-12, so 1 picometer equals 10^-12 metres. Such extremely small magnitudes are primarily encountered in particle‑physics and quantum‑scale modelling.