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Per Google:

A nanometer (nm) is a unit of length in the metric system, equal to one-billionth of a meter (10⁻⁹ meters). It's a microscopic scale used to measure things like the width of a DNA strand (about 2.5 nm) or the diameter of a single gold atom (about a third of a nm). The prefix "nano-" itself comes from the Greek word for "dwarf," emphasizing the tiny size of this unit.
 






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