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2.817 940 285 (31) × 10 −15 [13] The Compton wavelength of the electron λ C: 2.426 310 215 (18) × 10 −12 [13] The reduced Compton wavelength of the electron λ C: 3.861 592 6764 (18) × 10 −13 [14] The Compton wavelength (or reduced Compton wavelength) of any fundamental particle λ x: The Bohr radius of the hydrogen atom (Atomic unit ...
Spat – a unit of length equal to 1,000,000,000 km (620,000,000 mi) Stadion; Step; Unglie; Vara – an Aragonese, Spanish, and Portuguese unit [3] Yojana – a Vedic measure of distance used in ancient India. Its value was about 10 km (6.2 mi), although the exact value is disputed among scholars (between 8 and 13 km or 5 and 8 mi)
line length = wheel circumference × teeth counted/teeth on wheel. In more sophisticated models, sometimes called a chartometer, the wheel is connected via gearing to a rotary dial from which the line length can be directly read. [1] The instrument is most commonly used to measure the lengths of roads, rivers and other line features on maps ...
A unit of length equal to 66 feet (20.117 m), used especially in public land surveys in the United States; 10 square chains is equal to 1 acre (0.40 hectares). Though the literal chains used to measure this distance have long been superseded, surveying tapes are often still called "chains", and measuring with a tape may be called "chaining". [11]
The rod, perch, or pole (sometimes also lug) is a surveyor's tool [1] and unit of length of various historical definitions. In British imperial and US customary units, it is defined as 16 + 1 ⁄ 2 feet, equal to exactly 1 ⁄ 320 of a mile, or 5 + 1 ⁄ 2 yards (a quarter of a surveyor's chain), and is exactly 5.0292 meters.
Length measurement, distance measurement, or range measurement (ranging) all refer to the many ways in which length, distance, or range can be measured. The most commonly used approaches are the rulers, followed by transit-time methods and the interferometer methods based upon the speed of light. Surveying is one ancient use of measuring long ...
Width and breadth usually refer to a shorter dimension than length. Depth is used for the measure of a third dimension. [2] Length is the measure of one spatial dimension, whereas area is a measure of two dimensions (length squared) and volume is a measure of three dimensions (length cubed).
Geographical distance or geodetic distance is the distance measured along the surface of the Earth, or the shortest arch length. The formulae in this article calculate distances between points which are defined by geographical coordinates in terms of latitude and longitude. This distance is an element in solving the second (inverse) geodetic ...
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