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Micrometre
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A micrometre or micron (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 .
Human hair is 100 µm wide. Red blood cells are 7 µm in diameter.
The micrometre is a common unit of measurement for wavelengths of infrared radiation.

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Encyclopedia
A micrometre or micron (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 .
Human hair is 100 µm wide. Red blood cells are 7 µm in diameter.
The micrometre 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 micrometre. This practice persists in the face of official discouragement, perhaps to help disambiguate between the unit of measurement and the micrometer, a measuring device.
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
- µ
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