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  2. Orders of magnitude (length) - Wikipedia

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

    22 cm = 2.2 dm – diameter of a typical association football (soccer ball) 30 cm = 3 dm – typical school-use ruler length (= 300 mm) 30.48 cm = 3.048 dm – 1 foot (measure) 60 cm = 6 dm – standard depth (front to back) of a domestic kitchen worktop in Europe (= 600 mm) 90 cm = 9 dm – average length of a rapier, a fencing sword [30]

  3. French catheter scale - Wikipedia

    en.wikipedia.org/wiki/French_catheter_scale

    The French scale measures the outer diameter of the catheter, not the size of the internal drainage channel (inner diameter). For instance, a two-way catheter of 20 Fr and a three-way catheter of 20 Fr have the same outer diameter, but the three-way catheter has an additional channel for irrigation, reducing the size of its drainage channel.

  4. Harsola copper plates - Wikipedia

    en.wikipedia.org/wiki/Harsola_copper_plates

    The copper plates are rectangular in shape, and are inscribed only one side. The first copper plate of Grant A is 21.5 cm x 13 cm in size, and includes 16 lines. The second plate is of 21 cm x 8.5 cm in size, and contains 11 lines. Both the Grant B copper plates measure about 20 cm x 13 cm, and contain 16 and 13 lines respectively. [2]

  5. Inch - Wikipedia

    en.wikipedia.org/wiki/Inch

    2.54 centimeters (1 inch is exactly 2.54 cm) 25.4 millimetres ... Johansson's compromise was to manufacture gauge blocks with a nominal size of 25.4mm, ...

  6. Length measurement - Wikipedia

    en.wikipedia.org/wiki/Length_measurement

    For small objects, different methods are used that also depend upon determining size in units of wavelengths. For instance, in the case of a crystal, atomic spacings can be determined using X-ray diffraction. [13] The present best value for the lattice parameter of silicon, denoted a, is: [14] a = 543.102 0504(89) × 10 −12 m,

  7. Golomb ruler - Wikipedia

    en.wikipedia.org/wiki/Golomb_ruler

    In mathematics, a Golomb ruler is a set of marks at integer positions along a ruler such that no two pairs of marks are the same distance apart. The number of marks on the ruler is its order, and the largest distance between two of its marks is its length. Translation and reflection of a Golomb ruler are considered trivial, so the smallest mark ...

  8. Measuring rod - Wikipedia

    en.wikipedia.org/wiki/Measuring_rod

    Excavations at Lothal dating to 2400 BCE have yielded one such ruler calibrated to about 1 ⁄ 16 inch (1.6 mm) [3] Ian Whitelaw (2007) holds that 'The Mohenjo-Daro ruler is divided into units corresponding to 1.32 inches (34 mm) and these are marked out in decimal subdivisions with remarkable accuracy—to within 0.005 inches (0.13 mm).

  9. Traditional French units of measurement - Wikipedia

    en.wikipedia.org/wiki/Traditional_French_units...

    ~1055 cm 2 ~1.136 sq ft The French square foot: toise carrée: 36 ~3.799 m 2 ~40.889 sq ft, or ~4.543 sq yd The French square fathom Paris: perche d'arpent carrée: 484 ~51.07 m 2 ~61.08 sq yd This was the main square perch in old French surveying. It is a square 22 pieds du roi on each side. vergée: 12 100 ~1277 m 2 ~1527 sq yd