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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. 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.

  4. Orders of magnitude (length) - Wikipedia

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

    2.326 Mmdiameter of the dwarf planet Eris, the largest trans-Neptunian object found to date; 2.376 Mmdiameter of Pluto; 2.707 Mmdiameter of Triton, largest moon of Neptune; 3.122 Mmdiameter of Europa, the smallest Galilean satellite of Jupiter; 3.476 Mmdiameter of Earth's Moon; 3.643 Mmdiameter of Io, a moon of Jupiter

  5. Diameter - Wikipedia

    en.wikipedia.org/wiki/Diameter

    Eratosthenes, who calculated the diameter of the Earth around 240 BC. Graph or network diameter – Length of shortest path between two nodes of a graph; Hydraulic diameterMeasure of a channel flow efficiency; Inside diameter* Semidiameter – Term in geometry; half of a shape's diameter; Sauter mean diameter – Average measure of ...

  6. Conversion of units - Wikipedia

    en.wikipedia.org/wiki/Conversion_of_units

    the statistical confidence interval or tolerance interval of the initial measurement; the number of significant figures of the measurement; the intended use of the measurement, including the engineering tolerances; historical definitions of the units and their derivatives used in old measurements; e.g., international foot vs. US survey foot.

  7. Circular mil - Wikipedia

    en.wikipedia.org/wiki/Circular_mil

    For example, one common wire size used in the NEC has a conductor diameter of 0.5 inches, or 500 mils, and thus a cross-section of = circular mils, written as 250 kcmil or 250 MCM, which is the first size larger than 0000 AWG used within the NEC.

  8. 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]

  9. Engineering tolerance - Wikipedia

    en.wikipedia.org/wiki/Engineering_tolerance

    For example, if a shaft with a nominal diameter of 10 mm is to have a sliding fit within a hole, the shaft might be specified with a tolerance range from 9.964 to 10 mm (i.e., a zero fundamental deviation, but a lower deviation of 0.036 mm) and the hole might be specified with a tolerance range from 10.04 mm to 10.076 mm (0.04 mm fundamental ...