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  2. Inch - Wikipedia

    en.wikipedia.org/wiki/Inch

    12 ft. Metric ( SI) units. 25.4 mm. A fire hydrant marked as 3-inch. The inch (symbol: in or ″) is a unit of length in the British Imperial and the United States customary systems of measurement. It is equal to 1 36 yard or 1 12 of a foot. Derived from the Roman uncia ("twelfth"), the word inch is also sometimes used to translate similar ...

  3. Millimetre - Wikipedia

    en.wikipedia.org/wiki/Millimetre

    The microwave is between 1 meter to 1 millimeter. The millimetre ( international spelling; SI unit symbol mm) or millimeter ( American spelling) is a unit of length in the International System of Units (SI), equal to one thousandth of a metre, which is the SI base unit of length. Therefore, there are one thousand millimetres in a metre.

  4. Thousandth of an inch - Wikipedia

    en.wikipedia.org/wiki/Thousandth_of_an_inch

    1 thou is equal to: 0.001 international inches (1 international inch is equal to 1,000 thou) 0.0254 mm, or 25.4 μm (1 millimetre is about 39.37 thou) History of usage. The introduction of the thousandth of an inch as a base unit in engineering and machining is generally attributed to Joseph Whitworth who wrote in 1857:

  5. Point (typography) - Wikipedia

    en.wikipedia.org/wiki/Point_(typography)

    A less precise definition is one pica equals 0.166 inches (4.2 mm), and one point 0.01383 inches (0.351 mm). It was also noticed that 83 picas is nearly equal to 35 cm, so the Type Founders Association also suggested using a 35 cm metal rod for measurements, but this was not accepted by every foundry.

  6. 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 corresponds to approximately 5.067 × 10−4 mm2. It is a unit intended for referring to the area of a wire with a circular cross section. As the definition of the unit contains π, it is easy to calculate area ...

  7. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    The centimetre ( SI symbol: cm) is a unit of length in the metric system equal to 10−2 metres ( 1 100 m = 0.01 m ). To help compare different orders of magnitude, this section lists lengths between 10 −2 m and 10 −1 m (1 cm and 1 dm). 1 cm – 10 millimetres. 1 cm – 0.39 inches. 1 cm – edge of a square of area 1 cm 2.

  8. English units - Wikipedia

    en.wikipedia.org/wiki/English_units

    22.23 mm = 7 ⁄ 8 inch Inch: 25.4 mm: 3 barleycorns (the historical legal definition) Nail: 57.15 mm: 3 digits = 2 + 1 ⁄ 4 inches = 1 ⁄ 16 yard Palm: 76.2 mm: 3 inches Hand: 101.6 mm: 4 inches Shaftment: 165 mm or 152 mm: Width of the hand and outstretched thumb, 6 + 1 ⁄ 2 inches before 12th century, 6 thereafter: Link: 201.2 mm: 7.92 ...

  9. Conversion of units - Wikipedia

    en.wikipedia.org/wiki/Conversion_of_units

    Conversion of units is the conversion of the unit of measurement in which a quantity is expressed, typically through a multiplicative conversion factor that changes the unit without changing the quantity. This is also often loosely taken to include replacement of a quantity with a corresponding quantity that describes the same physical property.