Units of Length
Length is a base dimension in the International System of Units. The SI unit of length is the meter, defined as the length of the path traveled by light in vacuum during a time interval of 1299792458 second (17th CGPM, 1983).
Maple knows the units of length listed in the following table.
meters, metre, metres
calibres, caliber, calibers
An asterisk ( * ) indicates the default context, an at sign (@) indicates an abbreviation, and under the prefixes column, SI indicates that the unit takes all SI prefixes, IEC indicates that the unit takes IEC prefixes, and SI+ and SI- indicate that the unit takes only positive and negative SI prefixes, respectively. Refer to a unit in the Units package by indexing the name or symbol with the context, for example, meter[SI] or ft[standard]; or, if the context is indicated as the default, by using only the unit name or symbol, for example, meter or ft.
The units of length are defined as follows.
A bohr is defined as 5.291772573×10−11 meter.
For each of the following units, there is defined both a standard and US survey unit, each being the appropriate inch.
A standard inch is defined as 2.54 centimeters.
A US survey inch is defined such that a meter is 39.37 US survey inches.
A mil is defined as 11000 inch.
A line is defined as 112 inch.
A barleycorn is defined as 13 inch.
A digit is defined as 0.75 inch.
A nail is defined as 2.25 inches.
A palm is defined as 3 inches.
A hand is defined as 4 inches.
A finger is defined as 4.5 inches.
A span is defined as 9 inches.
A foot is defined as 12 inches.
A cubit is defined as 1.5 feet.
A step is defined as 2.5 feet.
A yard is defined as 3 feet.
An ell is defined as 3.75 feet.
A pace is defined as 5 feet.
A fathom is defined as 6 feet.
The rod, pole, and perch are defined as 16.5 feet.
A furlong is defined as 660 feet.
A mile is defined as 5280 feet.
A league is defined as 3 miles.
A Gunter chain is defined as 66 feet.
A Gunter link is defined as 1100 Gunter chain.
A Ramsden chain is defined as 100 feet.
A Ramsden link is defined as 1100 Ramsden chain, or 1 foot.
For the following units, the context of the inch, foot, and mile is standard.
A UK nautical chain is defined as 15 feet.
A US nautical cable is defined as 720 feet.
A UK nautical cable is defined as 110 nautical mile.
A nautical mile is defined as 1852 metres.
A nautical league is defined as 3 nautical miles.
A printer's point is defined as 0.013837 inch.
A computer point is defined as 172 inch.
A TeX point is defined such that there are 72.27 points in an inch.
A pica is defined as 12 points of the corresponding context.
An astronomical unit is defined as 149597870691 meters.
A parsec is defined as a parallax second based on the astronomical unit.
A Julian or tropical light year is defined as the distance light travels in 1 Julian or tropical year.
A Julian or tropical hubble is defined as 1.×109 Julian or tropical light years.
A spat is defined as 1.×1012 meters, or 1 terameter.
An angstrom is defined as 1.×10−10 meters, or 100 picometers.
A fermi is defined as 1.×10−15 meters, or 1 femtometer.
A micron is another term for a micrometer.
A bicron is another term for a picometer.
The copper and molybdenum x-units are approximately 1.00207789×10−13 and 1.00209938×10−13 meters, respectively.
A microinch is defined as 1.×10−6 inch.
A calibre is defined as 1100 inch.
A marathon is defined as 26 miles and 385 yards.
A quadrant is defined as 1.×107 meters.
A electrical quadrant is defined as 1.×10−11 meter.
A planck length is defined as the square root of: the planck constant times the Newtonian gravitational constant, divided by twice π times the third power of the speed of light.
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