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A micrometer is a measurement device incorporating a calibrated screw used widely for precise measurement of small distances in mechanical engineering and machining as well as most mechanical trades. The first micrometer was developed by Jean Laurent Palmer of Paris in 1848.
Micron Definition: A micron is a unit of length equivalent to a millionth of a meter. 1 micron = 1 Î¼m = 10-6 m. Also Known As: micrometer, micrometre, Î¼m. Examples: Red blood cells are approximately 10 microns in diameter. Human hair is between 10 and 100 microns in diameter. Find Chemistry Definitions From A to Z.