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  2. Thousandth of an inch - Wikipedia

    en.wikipedia.org/wiki/Thousandth_of_an_inch

    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 ...

  3. Milliradian - Wikipedia

    en.wikipedia.org/wiki/Milliradian

    Thousandth of an inch, an inch-based unit often called a thou or a mil. Circular mil, a unit of area, equal to the area of a circle with a diameter of one thousandth of an inch. Square mil, a unit of area, equal to the area of a square with sides of length of one thousandth of an inch.

  4. Circular mil - Wikipedia

    en.wikipedia.org/wiki/Circular_mil

    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. It is a unit intended for referring to the area of a wire with a circular cross section.

  5. Mil - Wikipedia

    en.wikipedia.org/wiki/Mil

    mil (imperial), a length equivalent to 0.001 inch; Biblical mile (Hebrew: מיל / mīl), a length; Millilitre (SI-symbol mL or ml, informally "mil"), a volume; Millimetre (SI-symbol mm, informally "mil" or “mill”), a length; Milliradian (SI-symbol mrad, informally "mil", or three slightly different non-SI units), for angular measurement

  6. United States customary units - Wikipedia

    en.wikipedia.org/wiki/United_States_customary_units

    Thickness of aluminum foil is measured in mils (1 ⁄ 1000 inch, or 0.0254 mm) in the United States. Cross-sectional area of electrical wire is measured in circular mils in the U.S. and Canada, one circular mil (cmil) being equal to 5.067 × 10 −4 mm 2 (or 7.854 × 10 −7 in 2). Since this is so small, actual wire is commonly measured in ...

  7. Square mil - Wikipedia

    en.wikipedia.org/wiki/Square_mil

    A square mil is a unit of area, equal to the area of a square with sides of length one mil. ... (1 square inch is equal to 1 million square mils) 6.4516 ...

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  9. American wire gauge - Wikipedia

    en.wikipedia.org/wiki/American_wire_gauge

    The next wire size thicker than 4/0 has a cross section of 250 kcmil. A circular mil is the area of a wire one mil in diameter. One million circular mils is the area of a circle with 1,000 mil (1 inch) diameter. An older abbreviation for one thousand circular mils is MCM.