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  2. 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). 1.0 mm – 1/1,000 of a meter; 1.0 mm – 0.03937 inches or 5/127 (exactly)

  3. List of scale model sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_scale_model_sizes

    3.5 mm: Model railways (HO/h0) Exact HO scale (half O of 7 mm = 1 foot) 1:87: 3.503 mm: Model railways (HO/h0) Civilian and military vehicles. Often used to describe HO scale. Original nominal 25 mm figure scale; though a 6-foot human in 1:87 is closer to 21 mm. 1:82: 3.717 mm

  4. 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.

  5. United States Mint coin sizes - Wikipedia

    en.wikipedia.org/wiki/United_States_Mint_coin_sizes

    23 mm 6.22 g 1864-1873 Quarter (Clad) 24.26 mm 5.67 g 1965–present Quarter (40% Ag) 24.3 mm 5.75 g 1976(S) Quarter 24.3 mm 6.25 g 1796–1964 Dollar 26.5 mm 8.1 g 1979–Present [3] $10 Eagle 27 mm 17.5 g 1795–1933 $25 American Gold Eagle 27 mm 17.5 g 1986–present $50 American Platinum Eagle 27 mm 15.6 g 1997–present Large Cent 28 mm 10 ...

  6. French catheter scale - Wikipedia

    en.wikipedia.org/wiki/French_catheter_scale

    The Charrière is measured by the ''outer'' diameter, and is defined as 1 Fr = 1/3 mm, and thus 1 mm = 3 Fr; therefore the diameter of a round catheter in millimetres can be determined by dividing the French size by 3. [2] The French units roughly correspond to the outer circumference of the catheter (see table below).

  7. List of handgun cartridges - Wikipedia

    en.wikipedia.org/wiki/List_of_handgun_cartridges

    3 mm Kolibri.120 3.0.320 8.1.430 10.9: Rimless [2] ... several rifle and shotgun cartridges have also been chambered in a number of large handguns, ...

  8. System of units of measurement - Wikipedia

    en.wikipedia.org/wiki/System_of_units_of_measurement

    [3] The current international standard for the metric system is the International System of Units (Système international d'unités or SI). It is a system in which all units can be expressed in terms of seven units. The units that serve as the SI base units are the metre, kilogram, second, ampere, kelvin, mole, and candela.

  9. Traditional point-size names - Wikipedia

    en.wikipedia.org/wiki/Traditional_point-size_names

    Comparison table. Point Metric size American system ... ≈ 3.881 mm: Small Pica Cicéro: Rheinländer Discendian [17] Mediaan Rheinländer 12 ≈ 4.233 mm: