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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).

  3. Conversion of units - Wikipedia

    en.wikipedia.org/wiki/Conversion_of_units

    The condensate's healing length is given by: =. For a 23 Na condensate with chemical potential of (the Boltzmann constant times) 128 nK, the calculation of healing length (in micrometres) can be done in two steps:

  4. Inch - Wikipedia

    en.wikipedia.org/wiki/Inch

    2.54 centimeters (1 inch is exactly 2.54 cm) 25.4 millimetres (1 inch is exactly 25.4 mm) ⁠ 1 / 12 ⁠ or 0.08333 feet ⁠ 1 / 36 ⁠ or 0.2777 yards; 10000 'tenths' [a] 1000 thou [b] or mil [c] 100 points [d] or gries [e] 72 PostScript points [f] 10, [g] [e] 12, [h] or 40 [i] lines; 6 computer picas [j] 3 barleycorns [k] 0.999998 US Survey ...

  5. List of unusual units of measurement - Wikipedia

    en.wikipedia.org/wiki/List_of_unusual_units_of...

    A metric ounce is an approximation of the imperial ounce, US dry ounce, or US fluid ounce. These three customary units vary. However, the metric ounce is usually taken as 25 or 30 ml (0.88 or 1.06 imp fl oz; 0.85 or 1.01 US fl oz) when volume is being measured, or in grams when mass is being measured.

  6. Shoe size - Wikipedia

    en.wikipedia.org/wiki/Shoe_size

    The last is typically longer than the foot heel to toe length by 4 ⁄ 3 cm (13.33 mm) to 5 ⁄ 3 cm (16.67 mm), or 2 to 2 + 1 ⁄ 2 Paris points, so to determine the shoe size based on actual foot length one must add 2 Paris points. Because a Paris point is 2 ⁄ 3 of a centimetre, a centimetre is 3 ⁄ 2 Paris points, and the formula is as ...

  7. Length measurement - Wikipedia

    en.wikipedia.org/wiki/Length_measurement

    Length measurement, distance measurement, or range measurement (ranging) all refer to the many ways in which length, distance, or range can be measured. The most commonly used approaches are the rulers, followed by transit-time methods and the interferometer methods based upon the speed of light .

  8. Significant figures - Wikipedia

    en.wikipedia.org/wiki/Significant_figures

    For example, if a ruler's smallest mark is 0.1 cm, and 4.5 cm is read, then it is 4.5 (±0.1 cm) or 4.4 cm to 4.6 cm as to the smallest mark interval. However, in practice a measurement can usually be estimated by eye to closer than the interval between the ruler's smallest mark, e.g. in the above case it might be estimated as between 4.51 cm ...

  9. Metric prefix - Wikipedia

    en.wikipedia.org/wiki/Metric_prefix

    A metric prefix is a unit prefix that precedes a basic unit of measure to ... (10 3) 2 × m 2 = 9 × 10 6 m 2 = 9 ... the length of the day is usually standardised to ...