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To help compare different orders of magnitude, this section lists lengths between 10 −15 meters and 10 −14 meters (1 femtometer and 10 fm). 1 fm – diameter of a neutron, approximate range-limit of the color force carried between quarks by gluons [6] [7] 1.5 fm – diameter of the scattering cross section of an 11 MeV proton with a target ...
A cable's length (often "cable length" or just "cable") is simply the standard length in which cables came, which by 1555 had settled to around 100 fathoms (600 ft; 180 m) or 1 ⁄ 10 nautical mile (0.19 km; 0.12 mi). [1] Traditionally rope is made on long ropewalks, the length of which determines the maximum length of rope it is possible to make.
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.
The yard (symbol: yd) [3] [4] is an English unit of length in both the British imperial and US customary systems of measurement equalling 3 feet or 36 inches. Since 1959 it has been by international agreement standardized as exactly 0.9144 meter. A distance of 1,760 yards is equal to 1 mile. The US survey yard is very slightly longer.
The shed is a unit of area used in nuclear physics equal to 10 −24 barns (100 rm 2 = 10 −52 m 2). The outhouse is a unit of area used in nuclear physics equal to 10 −6 barns (100 am 2 = 10 −34 m 2). The barn (b) is a unit of area used in nuclear physics equal to one hundred femtometres squared (100 fm 2 = 10 −28 m 2).
Length, in meters Reference The classical electron radius r e: 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 ...
The yard lines are also identified at 10-yard intervals by orange markers placed outside the sidelines adjacent to the respective line. Yard lines other than multiples of 5 are marked by 2-foot (0.61 m) long, 4-inch (0.10 m) wide lines painted parallel to the goal lines at 1-yard intervals spanning the length of the field just inside each ...
The international yard was about two millionths of a meter longer than the imperial yard, while the international pound was about six ten-millionths of a kilogram lighter than the imperial pound. [13] The metric-based international yard and international pound were adopted by the United States National Bureau of Standards effective 1 July 1959.