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  2. Orders of magnitude (length) - Wikipedia

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

    Dimensions of a credit card, according to the ISO/IEC 7810 ID-1 standard 73–75 mm Diameter of a baseball, according to Major League Baseball guidelines [28] 10 −1: 1 decimeter 120 mm Diameter of a compact disc: 660 mm Length of the longest pine cones, produced by the sugar pine [29] 900 mm Average length of a rapier, a fencing sword [30]

  3. Unit of length - Wikipedia

    en.wikipedia.org/wiki/Unit_of_length

    Before the establishment of the decimal metric system in France during the French Revolution in the late 18th century, [4] many units of length were based on parts of the human body. [5] [6] The Nippur cubit was one of the oldest known units of length. The oldest known metal standard for length corresponds to this Sumerian unit and dates from ...

  4. 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.

  5. Bed size - Wikipedia

    en.wikipedia.org/wiki/Bed_size

    Adjustable beds or electric adjustable bed sizes differ from the standard bed size. The length of these beds differ from a standard size due to the nature of the bed needing to bend. So they are 200 cm in length rather than 191 cm. King size and super king size are normally two 75 cm or two 90 cm adjacent beds. [25]

  6. File:Comparison optical telescope primary mirrors.svg

    en.wikipedia.org/wiki/File:Comparison_optical...

    Comparison of optical telescope primary mirrors: Image title: Comparison of nominal sizes of primary mirrors of notable optical telescopes compared with some other telescopes and objects, by CMG Lee. Dotted lines show mirrors with equivalent light-gathering ability. Thanks to user at 71.41.210.146 for data on holes in mirrors. Width: 100% ...

  7. List of conversion factors - Wikipedia

    en.wikipedia.org/wiki/List_of_conversion_factors

    The angle subtended at the center of a circle by an arc whose length is equal to the circle's radius. One full revolution encompasses 2π radians. = 1 rad sextant: ≡ 60° ≈ 1.047 198 rad: sign: ≡ 30° ≈ 0.523 599 rad

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