The Micrometre reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Micrometre

A micrometre (American spelling: micrometer), symbol µm is an SI unit of length. It is defined as one millionth of a metre (1 × 10⁻⁶ m), equivalent to one thousandth of a millimetre. The symbol µ is the "micro sign"; it is derived from the Greek letter mu (μ). The micrometre is a common unit of measurement for wavelengths of infrared radiation.

Some people (especially in astronomy and the semiconductor business) use the old name micron and/or the solitary symbol µ, for the same thing, even though it is officially discouraged.

A micrometer is the name of a tool that measures the thickness of objects. In American English, the spelling of the tool and the unit are identical.

nanometre << micrometre << millimetre

See also

• 1 E-6 m (a list of objects on the order of one to ten micrometres)

External link

• Conversion Calculator for Units of LENGTH

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