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  2. Boxing ring - Wikipedia

    en.wikipedia.org/wiki/Boxing_ring

    The platform of the ring is generally 3 to 4 feet (0.91 to 1.22 m) from the ground and is covered by about 1 inch (25 mm) of padding topped by stretched canvas. The ropes are approximately 1 inch (25 mm) in diameter and at heights of 18, 30, 42, and 54 inches (.46, .76, 1.07, and 1.37 m) above the mat, held up on posts rising around 5 feet (1.5 ...

  3. Ring size - Wikipedia

    en.wikipedia.org/wiki/Ring_size

    Originally in 1945, the divisions were based on the ring inside diameter in steps of 1 ⁄ 64 inch (0.40 mm). [6] However, in 1987 BSI updated the standard to the metric system so that one alphabetical size division equals 1.25 mm of circumferential length. For a baseline, ring size C has a circumference of 40 mm. [7]

  4. Orders of magnitude (length) - Wikipedia

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

    The millimetre (SI symbol: mm) is a unit of length in the metric system equal to 10 −3 metres (⁠ 1 / 1 000 ⁠ m = 0.001 m). To help compare different orders of magnitude , this section lists lengths between 10 −3 m and 10 −2 m (1 mm and 1 cm).

  5. 155 mm caliber - Wikipedia

    en.wikipedia.org/wiki/155_mm_caliber

    Despite superficially appearing to be inferior based on a simple comparison of round diameters, when firing conventional ammunition the smaller, 4.5 inch Mark 8 naval gun is comparable to the standard 155 mm (6.1 in) gun-howitzer of the British Army. The standard shell from a 4.5 inch Mark 8 naval gun has the same, if not better, range.

  6. 6 mm caliber - Wikipedia

    en.wikipedia.org/wiki/6_mm_caliber

    7 mm» This is a list of firearm cartridges which have bullets of a caliber between 6 millimetres (0.236 in) and 6.99 millimetres (0.275 in). Length refers to the cartridge case length

  7. Millimetre - Wikipedia

    en.wikipedia.org/wiki/Millimetre

    Different lengths as in respect to the electromagnetic spectrum, measured by the metre and its derived scales.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.

  8. Orders of magnitude (area) - Wikipedia

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

    Cross-sectional area of a mechanical pencil lead (0.5-0.7 mm in diameter) [16] 10 −6: 1 square millimetre (mm 2) 1–2 mm 2: Area of a human fovea [17] 2 mm 2: Area of the head of a pin: 10 −5 30–50 mm 2: Area of a 6–8 mm hole punched in a piece of paper by a hole punch [18] 10 −4: 1 square centimetre (cm 2) 290 mm 2: Area of one side ...

  9. Unit of length - Wikipedia

    en.wikipedia.org/wiki/Unit_of_length

    A ruler, depicting two customary units of length, the centimeter and the inch. A unit of length refers to any arbitrarily chosen and accepted reference standard for measurement of length. The most common units in modern use are the metric units, used in every country globally.