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Roman Actus


The actus was an ancient Roman unit of length used primarily in land measurement. It is approximately 120 Roman feet, which equals about 35.5 meters (around 116.5 feet).


The actus was often used to define dimensions of fields and plots of land. It was also part of Roman surveying practices, helping organize land division and property boundaries.


Key facts:



  • 1 actus = 120 Roman feet ≈ 35.5 meters



  • Used in Roman land surveying and agriculture



  • Essential for measuring fields and agricultural plots



  • Reflects the Roman emphasis on precise land division



The actus highlights the sophistication of Roman engineering and property management in their time.



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.



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