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  2. 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).

  3. List of scale model sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_scale_model_sizes

    1:480. 0.635 mm. Model railways (T) T scale, using 3 mm gauge track to represent standard gauge railways. 1:450. 0.677 mm. Model railways (T) T scale, using 3 mm gauge track to represent 3 ft 6 in (1,067 mm) gauge railways. Hasegawa also produces plastic ship models in this scale.

  4. United States Mint coin sizes - Wikipedia

    en.wikipedia.org/wiki/United_States_Mint_coin_sizes

    The figures cited in the tables are representative of the series, and are generally the latest, or most common, figures for a given coin type. The largest coin ever minted by the US Mint was the 2019 Apollo 50th anniversary 5ounce silver dollar, weighing 155.517 grams, and 76.2 mm in diameter. [5]

  5. Metric system - Wikipedia

    en.wikipedia.org/wiki/Metric_system

    The metric system is a decimal -based system of measurement. The current international standard for the metric system is the International System of Units (Système international d'unités or SI), in which all units can be expressed in terms of seven base units: the metre (m), kilogram (kg), second (s), ampere (A), kelvin (K), mole (mol), and ...

  6. Traditional point-size names - Wikipedia

    en.wikipedia.org/wiki/Traditional_point-size_names

    Traditional point-size names. Example of type sizes used in the books and newspapers: (1) Great Primer (18 pt, 6.35 mm), (2) English (14 pt, ≈4.939 mm), (3) Pica (12 pt, ≈4.233 mm), (4) Small Pica (11 pt, ≈3.881 mm), (5) Long Primer (10 pt, ≈3.528 mm), (6) Bourgeois (9 pt, 3.175 mm),

  7. Ring size - Wikipedia

    en.wikipedia.org/wiki/Ring_size

    In the United States, Canada, and Mexico, ring sizes are specified using a numerical scale with 1⁄4 steps, where whole sizes differ by 0.032 inches (0.81 mm) of internal diameter, equivalent to 0.1005 inches (2.55 mm) of internal circumference. The relationship of this size ( ) to ISO 8653:2016 circumference ( ) is , while the relationship to ...

  8. Centimetre - Wikipedia

    en.wikipedia.org/wiki/Centimetre

    A centimetre (International spelling) or centimeter (American spelling), with SI symbol cm, is a unit of length in the International System of Units (SI) equal to one hundredth of a metre, centi being the SI prefix for a factor of ⁠ 1 100 ⁠. [1] Equivalently, there are 100 centimetres in 1 metre. The centimetre was the base unit of length ...

  9. List of metric units - Wikipedia

    en.wikipedia.org/wiki/List_of_metric_units

    Toggle the table of contents. List of metric units. ... Metric units are units based on the metre, ... is a unit of wavenumber equal to 1 cm −1 (100 m −1).

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