There are one million nanometers in one millimeter.
A nanometer is one billionth of a meter.
You would have to line up roughly 25,400,000 nanometers end-to-end
in order to cover 1 inch.
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A centimeter is equal to 1x10^-2 meters, whereas a nanometer is equal to 1x10^-9 meters. In other words, there are 100 centimeters in a meter and there are 1,000,000,000 (1 billion) nanometers in a meter. Therefor, a nanometer is much smaller than a centimeter.
A nanometer
One million nanometer.
A millimicron is the same as a nanometer (one billionth of one meter).
One billionth of a metre is a nanometre.