micrometre
A micrometre (American spelling: micrometer; symbol µm) is one millionth of a metre, or equivalently one thousandth of a millimetre. 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 is not 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 [BIPM - Resolution 7 of the 13th CGPM (1967/68), "Abrogation of earlier decisions (micron, new candle)".]) 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.
See also
1 E-6 m (for a comparative description of the micrometre in the context of other orders of magnitude)
SI
SI prefix
Metric system
Orders of magnitude
Micronization
References
|
|
|
|
This section is sponsored by:
Lowest Priced Computers
Get the lowest prices on laptops, desktops and computer accessories
www.Geeks.com
Laptops - Save Money and Time
Complete Laptop at Cheap Price! Compare &Deal Here.
Laptop-s.cn
HP Laptops & Notebooks
Find great deals on HP laptops & notebooks along with accessories for your computer.
www.shopping.hp.com
Buy Computers Cheap
Get Computer,Laptop,Acces. Save and Order Now!
Portable-LaptopComputers.com
Complete Laptop &Accessories
Need laptop &accessories in new tech? Find here at affordable Price.
Computer-Laptop.net
Get a Mac Computer
Find the Mac computer that fits your needs from the Macbook to the iMac
store.apple.com
Laptop & Desktop Computers
Find great deals & low prices brand name laptops and desktop computers.
www.buy.com
Get a Free Laptop Now
100% Free Brand Name Laptop. Hurry - supplies are limited.
www.GetFreeLaptopsNow.com
|
