Everything about Micrometre totally explained
A
micrometer (
British spelling:
micrometre; symbol
µm) is one
millionth of a
meter, or equivalently one thousandth of a
millimeter. It is also commonly known as a
micron. It can be written in
scientific notation as 1×10
−6 m, meaning .
The symbol µm's character µ (
Unicode character U+00B5;
HTML µ) is "
micro-", which should look identical to the
Greek letter mu (μ) (the two may or may not look the same, depending on the
font). The symbol µm is sometimes replaced by "um" when a suitable
glyph for µ isn't readily available, for example in
ASCII or when using a
typewriter, although this is non-standard.
The micrometer is a common unit of
measurement for
wavelengths of
infrared radiation. Some people (especially in
astronomy and the
semiconductor industry) use the old name micron and/or the solitary symbol µ (both of which were official between 1879 and 1967) to denote a micrometer. This practice persists in the face of official discouragement, perhaps to help disambiguate between the
unit of measurement and the
micrometer, a measuring
device.
Input
The µ symbol can be entered the following ways:
Alt+230 - Alt code from CP437 and other IBM codepages; on Windows and DOS.
-
Alt+0181 - Alt code from ISO-8859-1 etc; on Windows.
-
AltGr+m - on many non-US keyboard layouts, also Option+m on a Mac.
-
Ctrl+Shift+B5 - Unicode hex code; on Linux.
Further Information
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