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  2. Conversion of units - Wikipedia

    en.wikipedia.org/wiki/Conversion_of_units

    Conversion of units is the conversion of the unit of measurement in which a quantity is expressed, typically through a multiplicative conversion factor that changes the unit without changing the quantity. This is also often loosely taken to include replacement of a quantity with a corresponding quantity that describes the same physical property ...

  3. 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 ...

  4. French catheter scale - Wikipedia

    en.wikipedia.org/wiki/French_catheter_scale

    [1] 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).

  5. 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.

  6. Inch - Wikipedia

    en.wikipedia.org/wiki/Inch

    12 ⁠ ft. Metric ( SI) units. 25.4 mm. A fire hydrant marked as 3-inch. The inch (symbol: in or ″) is a unit of length in the British Imperial and the United States customary systems of measurement. It is equal to ⁠ 1 36 ⁠ yard or ⁠ 1 12 ⁠ of a foot. Derived from the Roman uncia ("twelfth"), the word inch is also sometimes used to ...

  7. United States customary units - Wikipedia

    en.wikipedia.org/wiki/United_States_customary_units

    Length. For measuring length, the U.S. customary system uses the inch, foot, yard, and mile, which are the only four customary length measurements in everyday use. From 1893, the foot was legally defined as exactly 1200⁄3937 m (approximately 0.304 8006 m ). [13] Since July 1, 1959, the units of length have been defined on the basis of 1 yd ...

  8. Circular mil - Wikipedia

    en.wikipedia.org/wiki/Circular_mil

    A circular milis a unitof area, equal to the area of a circlewith a diameterof one mil(one thousandth of an inch or 0.0254 mm). It corresponds to approximately 5.067×10−4 mm2. It is a unit intended for referring to the area of a wire with a circular cross section.

  9. Bra size - Wikipedia

    en.wikipedia.org/wiki/Bra_size

    An underwire size 30 width has a curvature diameter of 3 + 5 ⁄ 6 inches (9.7 cm) and this diameter increases by 1 ⁄ 3 inch (0.85 cm) by size. [101] The table below shows volume calculations for some cups that can be found in a ready-to-wear large size shop. [102]

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