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In both customary and imperial units, one foot comprises 12 inches, and one yard comprises three feet. Since an international agreement in 1959, the foot is defined as equal to exactly 0.3048 meters. Historically, the "foot" was a part of many local systems of units, including the Greek, Roman, Chinese, French, and English systems. It varied in ...
One metre is exactly equivalent to 5 000 / 127 inches and to 1 250 / 1 143 yards. A simple mnemonic to assist with conversion is "three 3s": 1 metre is nearly equivalent to 3 feet 3 + 3 ⁄ 8 inches. This gives an overestimate of 0.125 mm. The ancient Egyptian cubit was about 0.5 m (surviving rods are 523–529 mm). [27]
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 = 0.9144 ...
The basic unit of length in the imperial and U.S. customary systems is the yard, defined as exactly 0.9144 m by international treaty in 1959. [2] [10] Common imperial units and U.S. customary units of length include: [11] thou or mil (1 ⁄ 1000 of an inch) inch (25.4 mm) foot (12 inches, 0.3048 m) yard (3 feet, 0.9144 m)
The other units of length and mass, and all units of area, volume, and derived units such as density were derived from these two base units. Mesures usuelles (French for customary measures) were a system of measurement introduced as a compromise between the metric system and traditional measurements. It was used in France from 1812 to 1839.
The micrometre (SI symbol: μm) is a unit of length in the metric system equal to 10 −6 metres ( 1 / 1 000 000 m = 0. 000 001 m). To help compare different orders of magnitude , this section lists some items with lengths between 10 −6 and 10 −5 m (between 1 and 10 micrometers , or μm).
In the late 13th century, the modern foot of 304.8 mm was introduced, equal to exactly 10 ⁄ 11 Anglo-Saxon foot. Cubit: 457.2 mm: From fingertips to elbow, 18 inches. Yard: 0.914 m: 3 feet = 36 inches, the practical base unit, defined as the length of the prototype bar held by the Crown or Exchequer. Ell: 1.143 m
An ahm (anglicised as "aum" - using the French spelling) was a Dutch and German measure of wine that was a fourth of a legger. It was also roughly equivalent to a British tierce [159.1 (≈159) liters, 35 Imp. gals.], a measure equal to a third of a butt. 1 half-pipe [55 Dutch gallons, 208.29 L iters, 45. 81 (≈46) Imp. gals.]