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 Microchips are made up of large numbers of small circuit elements known as transistors. A microchip can contain from hundreds to nearly a billion transistors. In order to fit all of these circuits on a microchip, they must be extremely small. Historically, circuits have been measured in microns, or one thousandth of one millimeter—approximately 70 times smaller than the width of a human hair. Today’s advanced technologies produce circuits so small they are measured in nanometers, or one thousandth of one micron. That is thousands of times smaller than the width of a human hair.
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