The term micron and the symbol μ were officially accepted for use in isolation to denote the micrometre in 1879, but officially revoked by the International System of Units (SI) in 1967.[7] This became necessary because the older usage was incompatible with the official adoption of the unit prefix micro-, denoted μ, during the creation of the SI in 1960.
micron
Additionally, in American English, the use of "micron" helps differentiate the unit from the micrometer, a measuring device, because the unit's name in mainstream American spelling is a homograph of the device's name. In spoken English, they may be distinguished by pronunciation, as the name of the measuring device is often stressed on the second syllable (/maɪˈkrɒmɪtər/ my-KROM-it-ər), whereas the systematic pronunciation of the unit name, in accordance with the convention for pronouncing SI units in English, places the stress on the first syllable (/ˈmaɪkroʊˌmiːtər/ MY-kroh-meet-ər).
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Since 40-50 micron objects are the smallest things visible to the naked human eye, these extremely small dimensions can be hard to wrap your head around. So, we decided to use some great laser microscope images to put size in perspective.
Micron is short for micrometer, one-millionth of a meter, or 1 x 10-6 (denoted µ). Since the metric system is very rational, there are 1,000 microns in a millimeter and 10,000 microns in a centimeter.
The eye of a fruit fly is also 70 microns across. But the eye itself isn't the smallest unit: each eye is made up of 760-unit eyes that are about 5 microns in diameter each! This is similar to the placement tolerance Benchmark achieves in fully automated microelectronic assembly.
Moving to more familiar territory, our own bodies, our cells are on a similar scale to the placement precision required in microelectronics. A human skin cell is 20-40 microns across, and a white blood cell is approximately 30 microns. Red blood cells get closer to microelectronics tolerances with an average width of 6-8 microns.
To find things that are one micron, you really have to get sub-cellular. A human mitochondrion is 1 micron across but 7 microns long. Small bacteria can be as small as .5 microns. This is comparable to the placement precision Benchmark achieves in semi-automated microelectronic assembly for applications such as lidar, free space optics, medical imaging, and photonics communications and computing applications.
All of this just goes to show that sometimes the smallest things can make the biggest difference. At only one micron wide our mitrochondria are tiny, but we wouldn't survive without them. Similarly, 1 micron precision in microelectronics placement is key to the functioning of these high-tech products. 2ff7e9595c
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