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The nautical mile (nmi) was originally defined as the arc length of a minute of latitude on a spherical Earth, so the actual Earth circumference is very near 21 600 nmi. A minute of arc is π 10 800 of a radian. A second of arc, arcsecond (arcsec), or arc second, denoted by the symbol ″, [2] is 1 60 of an arcminute, 1 3600 ...
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).
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 ...
Park railroads, where 15 in (381 mm) minimum gauge models are based on 3 ft (914 mm) narrow gauge prototypes 1:2: 6 in: 152.40 mm "My Size" (3 ft) fashion dolls: 1:1.8 Playhome, Playhouse 1:1.5 Playhome, Playhouse 1:1: 12 in: 304.80 mm Full scale, life-size. Some models of real and fictional weapons and of scientific or anatomical subjects in ...
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 = 0 ...
0.3048 m. 30.48 cm. 304.8 mm. The foot (standard symbol: ft) [1][2] is a unit of length in the British imperial and United States customary systems of measurement. The prime symbol, ′, is commonly used to represent the foot. [3] In both customary and imperial units, one foot comprises 12 inches, and one yard comprises three feet.
Metrication in the United States. A shampoo label from the U.S. that shows a round metric quantity taking secondary status in parentheses next to non-integer U.S. customary quantity. Metrication (or metrification) is the process of introducing the International System of Units, also known as SI units or the metric system, to replace a ...
100 / 33 m. 3.030 m. 125,000 / 37,719 yd. 9 ft 11.3 in. Taiwanese fathom; Same as Japanese Jō. Taiwanese length units and the translation of length units in metric system (SI) shares the same character. The adjective Taiwanese (台) can be added to address the Taiwanese unis system. For example, 台尺 means Taiwanese foot and 公尺 ...