iki/American_English" id="whe_lnki_38" title="American English">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 despite being homographs they are not homophones
; the name of the measuring device is invariably stressed on the second syllable, 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.)
This older usage was pluralized either as "microns" or "micra", the latter being arguably more correct, although that debate became less relevant after 1967, as the micron and its plural forms have been deprecated for almost half a century.
^ a b c "micrometre". Encyclopedia Britannica Online. Retrieved 18 May 2014.
^ "Wool Fibre". "NSW Department of Education and Communities". Retrieved 18 May 2014.
^ BIPM - Resolution 7 of the 13th CGPM (1967/68), "Abrogation of earlier decisions (micron, new candle.)"