High Quality Content by WIKIPEDIA articles! A micrometre or micron is one millionth of a metre, or equivalently one thousandth of a millimetre or one thousand nanometres. It can also be written in scientific notation as 1x10?6 m, meaning 1?1000000 m. A strand of human hair is about 100 µm wide. Red blood cells are approx. 8 µm in diameter. The micrometre is a common unit of measurement for wavelengths of infrared radiation. The name micron and the solitary symbol µ (both of which were official between 1879 and 1967) are still used (especially in astronomy and in the semiconductor industry) to denote a micrometre

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