Nano-

Prefix denoting 10 to the −9th power

Nano is a unit prefix meaning one billionth. Used primarily with the metric system, this prefix denotes a factor of 10−9 or 0.000000001. It is frequently encountered in science and electronics for prefixing units of time and length.ExamplesThree gold atoms lined up are about one nanometer (nm) long. If a toy marble were scaled down to one nanometer wide, Earth would scale to about 1 meter (3.3 ft) wide. One nanosecond (ns) is about the time required for light to travel 30 cm in air, or 20 cm in an optical fiber. One nanometer per second (nm/s) is approximately the speed that a fingernail grows.

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