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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).
This is a list of notable railway track gauge conversions, railway lines where the distance between the rails is broadened or narrowed.Conversions to broader gauge are generally to accommodate heavier loads or for wider cars, while conversions to narrower gauge tend to be for compatibility with other lines on a rail network.
By default, the output value is rounded to adjust its precision to match that of the input. An input such as 1234 is interpreted as 1234 ± 0.5, while 1200 is interpreted as 1200 ± 50, and the output value is displayed accordingly, taking into account the scale factor used in the conversion.
Track gauge conversion is the changing of one railway track gauge (the distance between the running rails) to another. In general, requirements depend on whether the conversion is from a wider gauge to a narrower gauge or vice versa, on how the rail vehicles can be modified to accommodate a track gauge conversion, and on whether the gauge conversion is manual or automated.
4 ft 11 in fertach: rod 12 3 m 9 ft 10 in forrach: 144 36 m 39.4 yards A magh-space was a unit set at the distance from which a cock-crow or bell could be heard.
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.
Conversions between units in the metric system are defined by their prefixes (for example, 1 kilogram = 1000 grams, 1 milligram = 0.001 grams) and are thus not listed in this article. Exceptions are made if the unit is commonly known by another name (for example, 1 micron = 10 −6 metre).
New lines and extensions to the MTR after 2014 use 1,435 mm (4 ft 8 + 1 ⁄ 2 in) gauge, including the South Island line, Kwun Tong line extension and West Island line. The Bucharest Metro uses 1,432 mm (4 ft 8 + 3 ⁄ 8 in) gauge. The Washington Metro uses 4 ft 8 + 1 ⁄ 4 in (1,429 mm), 1 ⁄ 4 in (6 mm) narrower than standard gauge.