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micron

Contributor(s): Phillip Acevedo

The micron, officially obsolete as a term of measurement, is sometimes used by microchip and wiring manufacturers in place of micrometer, one-millionth of a meter. The micron or micrometer can also be expressed as:

  • 10-6 meter
  • One thousandth of a millimeter
  • One 25th of a thousandth of an inch

The micron or micrometer is a unit of measure for the core in optical fiber, for which the most common diameter is 62.5 micrometers. It is also used to measure the line width on a microchip. Intel's Pentium 4 microprocessors are built using 0.18 or 0.13 micrometer line widths. AMD's Athlon uses a 0.18 line width.

A human hair is said to be about 50 micrometers wide.

This was last updated in September 2005

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10th October 2018
Despite what is written above, one "micron" is NOT one micro-metre (or 1µm), NOR is it one millionth of a metre.
However ONE micro-metre is equal to one-millionth of ONE metre.
Micron originally came from the old imperial unit of measurement using feet, inches, yards, a system still being used by many engineering companies in the USA.
Where-as metres, milli-metres, micro-metres, nano-metres are part of the "SI-system" which is the standard system used in Europe, and most of the rest of the world.
One "micron" is ONE-THOUSANDTH of ONE inch !!
Since One inch = 25.4 milli-metres ( written as 25.4mm ),
therefore ONE "micron" equals one-thousandth of 25.4mm or 0.0254mm.

So a "micron" is 25400 times bigger than One micro-metre !!!
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