Micrometre

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A micrometer is one-millionth of a metre (1/1000 of a millimetre, or 0.001mm). Its unit symbol in the International System of Units (SI) is μm.

The term micron and the symbol μ, representing the micrometre were officially accepted between 1879 and 1967, but abrogated(officially revoked) in 1967.[1] In practice it is still used, especially in American English, astronomy, and the semiconductor industry. The micrometre is a common unit of measurement for wavelengths of infrared radiation. The use of the term micron also helps differentiate the unit from the measuring device of the same name.

A single strand of hair usually has a diameter of 20 to 180 μm. Red blood cells are approximately 8 μm in diameter.[2]

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