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A thousandth of an inch is a derived unit of length in a system of units using inches. Equal to 1 ⁄ 1000 of an inch, a thousandth is commonly called a thou / ˈ θ aʊ / (used for both singular and plural) or, particularly in North America, a mil (plural mils). The words are shortened forms of the English and Latin words for "thousand" (mille ...
For instance the same angle of 0.1 mrad will subtend 10 mm at 100 meters, 20 mm at 200 meters, etc., or similarly 0.39 inches at 100 m, 0.78 inches at 200 m, etc. Subtensions in mrad based optics are particularly useful together with target sizes and shooting distances in metric units .
10 19: 10 Em: 9.46 Em Average thickness of Milky Way Galaxy [43] (1,000 to 3,000 ly by 21 cm observations [44]) 10 20: 100 Em: 113.5 Em Thickness of Milky Way Galaxy's gaseous disk [45] 10 21: 1 zettameter (Zm) 1.54 Zm Distance to SN 1987A, the most recent naked eye supernova 1.62 Zm Distance to the Large Magellanic Cloud (a dwarf galaxy ...
[1] [2] The basis of the system is the thou (or mil in US English), or 0.001 in. Sizes are specified as wire diameters, stated in thou and tenths of a thou (mils and tenths). The wire diameter diminishes with increasing size number. No. 7/0, the largest size, is 0.50 in. (500 thou or 12.7 mm) dia.,
When using "hand in" to convert to hands and inches, the rounded hands and inches values are equivalent, and use the same fraction, if any. Special rounding of the inches value only occurs when "hand in" is the output.
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A circular mil is a unit of area, equal to the area of a circle with a diameter of one mil (one thousandth of an inch or 0.0254 mm). It is equal to π /4 square mils or approximately 5.067 × 10 −4 mm 2 .
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