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2. 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.

3. Metric system - Wikipedia

   en.wikipedia.org/wiki/Metric_system

   This differs from many older systems in which the ratio of different units varied. For example, 12 inches is one foot, but the larger unit in the same system, the mile is not a power of 12 feet. It is 5,280 feet – which is hard to remember for many. [5]: 17

4. Human height - Wikipedia

   en.wikipedia.org/wiki/Human_height

   Height measurement using a stadiometer. Human height or stature is the distance from the bottom of the feet to the top of the head in a human body, standing erect.It is measured using a stadiometer, [1] in centimetres when using the metric system or SI system, [2] [3] or feet and inches when using United States customary units or the imperial system.

5. Shaku (unit) - Wikipedia

   en.wikipedia.org/wiki/Shaku_(unit)

   Shaku (Japanese: 尺) or Japanese foot [1] [2] is a Japanese unit of length derived (but varying) from the Chinese chi, originally based upon the distance measured by a human hand from the tip of the thumb to the tip of the forefinger [3] [a] (compare span). Traditionally, the length varied by location or use, but it is now standardized as 10/ ...

6. Irish units of measurement - Wikipedia

   en.wikipedia.org/wiki/Irish_units_of_measurement

   0.7 cm 1/4 inch ordlach: thumb-length 1 ⁄ 12: 2.1 cm 0.8 in bas: palm 1 ⁄ 3: 8.4 cm 3.3 in dorn: fist 5 ⁄ 12 or 1 ⁄ 2: 10.4 or 12.5 cm 4 or 5 in troighid: foot 1 25 cm 9.9 in céim: step 2.5 62.5 cm 2 ft 1 in deiscéim[m] double-step 6 1.5 m 4 ft 11 in fertach: rod 12 3 m 9 ft 10 in forrach: 144 36 m 39.4 yards

7. Orders of magnitude (length) - Wikipedia

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

   An adult human foot is about 28 cm (11 in) long. The decimetre ( SI symbol: dm ) is a unit of length in the metric system equal to 10 −1 metres ( ⁠ 1 / 10 ⁠ m = 0.1 m ). To help compare different orders of magnitude , this section lists lengths between 10 centimeters and 100 centimeters (10 −1 meter and 1 meter).