1 micrometre = SI units 1.000×10−6 m 1.0000 μm US customary / Imperial units 3.281×10−6 ft 39.37×10−6 in
The term micron and the symbol μ, representing the micrometre were officially accepted between 1879 and 1967, but officially revoked by the ISI in 1967.
In practice, micron is a widely used term in preference to micrometre in many English-speaking countries, and in American English the use of the term helps differentiate the unit from the micrometer, a measuring device, which would otherwise be spelled as a homonym with micrometre. The term micron has particular currency in science, and is extensively used in most English-speaking countries in the fields of geology, biology, physics, astronomy, and the semiconductor industry.
SI units of length
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