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  2. Orders of magnitude (length) - Wikipedia

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

    The micrometre (SI symbol: μm) is a unit of length in the metric system equal to 10 −6 metres (⁠ 1 / 1 000 000 ⁠ m = 0. 000 001 m). To help compare different orders of magnitude , this section lists some items with lengths between 10 −6 and 10 −5 m (between 1 and 10 micrometers , or μm).

  3. Shaku (unit) - Wikipedia

    en.wikipedia.org/wiki/Shaku_(unit)

    The shaku had been standardized as 30.3 cm (11.93 in) since 1891. [5] This means that there are about 3.3 shaku (10 ⁄ 33) to one meter. [6] [7]This definition was established by Meiji government law; until then, even though the unit was given the same name, its length varied depending on the era.

  4. Milliradian - Wikipedia

    en.wikipedia.org/wiki/Milliradian

    The metric prefix milli-(from Latin mille meaning "one thousand") and the radian: In units: Dimensionless with an arc length one thousandth of the radius, i.e. 1 ⁠ mm / m ⁠ or 1 ⁠ m / km ⁠ Conversions 1 mrad in ..... is equal to ... radians ⁠ 1 / 1000 ⁠ rad turns ⁠ 1 / 2000 π ⁠ turn gradians ⁠ 1 / 5 π ⁠ ≈ 0.063662 g

  5. History of the metric system - Wikipedia

    en.wikipedia.org/wiki/History_of_the_metric_system

    Units in everyday use by country as of 2019 The history of the metric system began during the Age of Enlightenment with measures of length and weight derived from nature, along with their decimal multiples and fractions. The system became the standard of France and Europe within half a century. Other measures with unity ratios [Note 1] were added, and the system went on to be adopted across ...

  6. List of unusual units of measurement - Wikipedia

    en.wikipedia.org/wiki/List_of_unusual_units_of...

    This translates to a hoppus foot being equal to 1.273 cubic feet (2,200 in 3; 0.0360 m 3). The hoppus board foot, when milled, yields about one board foot . The volume yielded by the quarter-girth formula is 78.54% of cubic measure (i.e. 1 ft 3 = 0.7854 h ft; 1 h ft = 1.273 ft 3 ).

  7. Historical Russian units of measurement - Wikipedia

    en.wikipedia.org/wiki/Historical_Russian_units...

    Skewed, or oblique sazhen' (косая сажень, kosaya sazhen', distance between tip of a raised arm and a tip of an opposite leg slightly put away) = 2.48 m / 2.4892 m to be exact, since 1 Kosaya Sazhen is equal to 3.5 Arshins which is equal to 98 inches

  8. List of humorous units of measurement - Wikipedia

    en.wikipedia.org/wiki/List_of_humorous_units_of...

    Volume was measured in ngogn (equal to 1000 cubic potrzebies), mass in blintz (equal to the mass of 1 ngogn of halva, which is "a form of pie [with] a specific gravity of 3.1416 and a specific heat of .31416"), and time in seven named units (decimal powers of the average earth rotation, equal to 1 "clarke"). The system also features such units ...

  9. Inch - Wikipedia

    en.wikipedia.org/wiki/Inch

    Paragraph LXVII sets out the fine for wounds of various depths: one inch, one shilling; two inches, two shillings, etc. [m] An Anglo-Saxon unit of length was the barleycorn. After 1066, 1 inch was equal to 3 barleycorns, which continued to be its legal definition for several centuries, with the barleycorn being the base unit. [22]