A metric unit of measure. Approximately 25.4 million nanometers equal one inch. nanoparticle - Small clusters of atoms about 1 to 100 nanometers long.
a billionth of a meter or 10-9 meters, used to measure the wavelength of light or the geometry of optical discs. For example DVD s are read using a laser with wavelength of 650 nm and minimum pit length is 400 nm.
Unit of measurement of light wavelength. A nanometer is one millionth of a millimeter.