also mi·kron n., pl. -crons or -cra (-krə) also -krons or -kra (-krə).

A unit of length equal to one millionth (10^-6) of a meter. No longer in technical use.

[From Greek mīkron, neuter of mīkros, small.]

One micrometer, which is one millionth of a meter or approximately 1/25,000 of an inch. The tiny elements that make up a transistor on a chip are measured in micrometers and nanometers. See process technology.

Magnified 800 Times

This is an 800x magnification of a few bits of RAM from an early Motorola microcontroller. Although the actual size of what you see in this picture would fit on a pinhead, the elements in the devices on this chip are several microns wide, which is quite large by today's standards.

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length. Symbol μ. (Metric) An SI-deprecated name for what is the micrometre; 10^-6 m = 1 μm.

1879	CIPM: introduced
1890s	symbol μ adopted
1948	9th CGPM: confirmed
1967-68	13th CGPM: ‘decides…to remove…the unit name “micron” and the symbol “μ” which had been given to that unit but which has now become a prefix.’see note below

[Le Système International d'Unités (Sèvres, France: Bureau International de Poids et Mesures, 1985)]

pressure From the above, equals 1 μm of mercury (0.133 322 4~ Pa).

A unit of length equal to a thousandth part of a millimeter or a millionth of a meter.

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Pl. micra, microns [Gr.] micrometer; one thousandth (10⁻³) of a millimeter or one millionth (10⁻⁶) of a meter; abbreviated μm.

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To convert from microns to:

meters, multiply by 1E-06.

Convert:  Into:  meters

Result:

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Dansk (Danish)
n. - mikron

Nederlands (Dutch)
micron (een miljoenste meter)

Français (French)
n. - micron

Deutsch (German)
n. - Mikrometer

Ελληνική (Greek)
n. - εκατομμυριοστόμετρο, μικρό(ν) (1/1000000 του μέτρου)

Italiano (Italian)
micron

Português (Portuguese)
n. - mícron (m) (Fís.)

Русский (Russian)
микрон

Español (Spanish)
n. - micrón

Svenska (Swedish)
n. - mikron

中文（简体） (Chinese (Simplified))
微米

中文（繁體） (Chinese (Traditional))
n. - 微米

한국어 (Korean)
n. - 마이크론(100만분의 1미터)

日本語 (Japanese)
n. - ミクロン

العربيه (Arabic)
‏(الاسم) الميكرون جزء من ألف من المليمتر‏

עברית (Hebrew)
n. - ‮אלפית המטר, מיקרון‬

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