A micrometre (American spelling: micrometer, symbol µm) is an SI unit of length equal to one millionth of a metre, or about a tenth of the diameter of a droplet of mist or fog. It is also commonly known as a micron. It can be written in exponential notations as 1×10⁻⁶ m (engineering notation) or 1 E-6 m (scientific notation) — both meaning 1 m / 1,000,000. For other uses, see American English (disambiguation). ... Look up si, Si, SI in Wiktionary, the free dictionary. ... For other uses of this word, see Length (disambiguation). ... Look up micro- in Wiktionary, the free dictionary. ... The metre, or meter (U.S.), is a measure of length. ... Scientific notation is a notation for writing numbers that is often used by scientists and mathematicians to make it easier to write large and small numbers. ...

nanometre <<< micrometre <<< millimetre < centimetre < decimetre < metre < decametre < hectometre < kilometre A nanometre (American spelling: nanometer, symbol nm) is a unit of length in the metric system, equal to one thousand-millionth of a metre, which is the current SI base unit of length. ... A millimetre (American spelling: millimeter, symbol mm) is an SI unit of length that is equal to one thousandth of a metre. ... A centimetre (American spelling centimeter, symbol cm) is a unit of length that is equal to one hundredth of a metre, the current SI base unit of length. ... A decimetre is a measurement of length, measuring 10 centimetres or one-tenth of a metre millimetre << centimetre << decimetre << metre << kilometre ... The metre, or meter (U.S.), is a measure of length. ... A decametre (American spelling: decameter) (symbol: dam) is a measurement of distance equal to ten metres. ... A hectometre (American spelling: hectometer) (symbol: hm) is a measurement of distance equal to 100 metres. ... km redirects here. ...

The symbol µm's character µ (Unicode character U+00B5; HTML µ) is the "micro sign", 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 "um" is sometimes used, when the µ and μ are not available, for example when using a typewriter. Unicode is an industry standard designed to allow text and symbols from all of the writing systems of the world to be consistently represented and manipulated by computers. ... HTML, short for HyperText Markup Language, is the predominant markup language for the creation of web pages. ... Micro sign (µ, ) is the Unicode character U+00B5. ... The Greek alphabet is an alphabet that has been used to write the Greek language since about the 9th century BCE. It was the first alphabet in the narrow sense, that is, a writing system using a separate symbol for each vowel and consonant alike. ... Look up Îœ, μ in Wiktionary, the free dictionary. ... For the origin and evolution of fonts, see History of western typography. ... Mechanical desktop typewriters, such as this Underwood Five, were long time standards of government agencies, newsrooms, and sales offices. ...

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. Various meters Measurement is the estimation of a physical quantity such as length, temperature, or time. ... The wavelength is the distance between repeating units of a wave pattern. ... Image of a small dog taken in mid-infrared (thermal) light (false color) Infrared (IR) radiation is electromagnetic radiation of a wavelength longer than visible light, but shorter than microwave radiation. ... A giant Hubble mosaic of the Crab Nebula, a supernova remnant Astronomy is the science of celestial objects (such as stars, planets, comets, and galaxies) and phenomena that originate outside the Earths atmosphere (such as auroras and cosmic background radiation). ... A semiconductor is a solid whose electrical conductivity can be controlled over a wide range, either permanently or dynamically. ... External, internal, and depth micrometers A micrometer is a widely used device in mechanical engineering for precisely measuring thickness of blocks, outer and inner diameters of shafts and depths of slots. ...

See also

• 1 E-6 m (for a comparative description of the micrometer in the context of other orders of magnitude)
• SI
• SI prefix
• Metric system
• Orders of magnitude
• Micrometer (device), a tool that measures the thickness of objects.
• Micronization