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Mil


A mil is a unit of length commonly used in engineering and manufacturing to measure very small distances, especially thicknesses. It is equal to one-thousandth of an inch (0.001 inch), which is approximately 0.0254 millimeters.


The mil is widely used in industries like plastic film, coatings, wire diameter, and mechanical parts, where precise measurements of thin materials are necessary. It should not be confused with the millimeter, which is 0.001 meters or 1,000 microns — much larger than a mil.


Key points:



  • 1 mil = 0.001 inch = 0.0254 mm



  • Used mainly for small thicknesses or diameters



  • Common in engineering, manufacturing, and material sciences



  • Not to be confused with millimeter (mm)



The mil remains an important unit in technical fields where fine measurement is critical.


Barleycorn


A barleycorn is an old English unit of length, traditionally based on the length of a grain of barley. It is defined as exactly 1/3 of an inch or approximately 8.47 millimeters.


Historically, the barleycorn was used for measuring small lengths and was also the basis for the inch, which was originally considered to be three barleycorns long. It played a role in various traditional measurements, including shoe sizing in English-speaking countries, where shoe sizes were sometimes expressed in barleycorn units.


Although obsolete as a formal unit, the barleycorn remains culturally significant, especially in shoe sizing systems.


Summary:



  • 1 barleycorn = 1/3 inch ≈ 8.47 mm



  • Based on the length of a grain of barley



  • Used historically in small measurements and shoe sizing



  • Mostly of historical and cultural interest today





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