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  2. 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.

  3. 20 mm caliber - Wikipedia

    en.wikipedia.org/wiki/20_mm_caliber

    The usual nomenclature of ammunition indicates the diameter of projectile and the length of the cartridge that holds it; for example, 20×102 mm is a 20 mm projectile in a 102 mm long case. Though this designation is often assumed to be unique, this is not always the case, e.g. there are three different 20×110 mm types which are not compatible.

  4. 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]

  5. United States Mint coin sizes - Wikipedia

    en.wikipedia.org/wiki/United_States_Mint_coin_sizes

    20.5 mm 5.01 g 1853–1876 Nickel 21.21 mm 5 g 1866–present Nickel 21.21 mm 5 g 1942–1945 Twenty Cent 22 mm 5 g 1875–1878 $5 Half Eagle 21.6 mm 8.36 g 1795–1929 $10 American Gold Eagle 22 mm 7.78 g 1986–present $25 American Platinum Eagle 22 mm 7.78 g 1997–present Half Cent 23.5 mm 6.74 g 1795–1857 Two Cent 23 mm 6.22 g 1864-1873 ...

  6. Basketball (ball) - Wikipedia

    en.wikipedia.org/wiki/Basketball_(ball)

    750–770 mm 29.5–30.3 in [4] 580–620 g 20–22 oz [4] Men and boys ages 15 and up. This is the official size for men's high school, college, and professional. 6: Women: 715–730 mm 28.1–28.7 in [4] 510–550 g 18–19 oz [4] Boys ages 12–14. Women and girls ages 12 and up. This is the official size for women's high school, college ...

  7. Caliber - Wikipedia

    en.wikipedia.org/wiki/Caliber

    Calibers fall into four general categories by size: [citation needed] miniature-bore historically refers to calibers with a diameter of 0.22 inches (5.6 mm) or smaller; small-bore refers to calibers with a diameter of 0.32 inches (8.1 mm) or smaller; medium-bore refers to calibers with a diameter of 0.33 inches (8.4 mm) to 0.39 inches (9.9 mm)

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  9. Orders of magnitude (length) - Wikipedia

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

    Equatorial diameter of Earth 20.004 Mm ... 1.5 cm – length of a very large mosquito; 1.6 cm – length of a Jaragua Sphaero, a very small reptile;