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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]
The prime symbol ′ is commonly used to represent feet (ft), and the double prime ″ is used to represent inches (in). [2] The triple prime ‴, as used in watchmaking, represents a ligne (1 ⁄ 12 of a "French" inch, or pouce, about 2.26 millimetres or 0.089 inches). [3] Primes are also used for angles.
The English word "foot" is a translation of the Latin term pes, plural pedes, which in turn is a translation of the Ancient Greek πούς, pl. πόδες. The Ancient Greek prosodists, who invented this terminology, specified that a foot must have both an arsis and a thesis, [ 2 ] that is, a place where the foot was raised ("arsis") and where ...
historical definitions of the units and their derivatives used in old measurements; e.g., international foot vs. US survey foot. For some purposes, conversions from one system of units to another are needed to be exact, without increasing or decreasing the precision of the expressed quantity.
A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula.
One slug is a mass equal to 32.17405 lb (14.59390 kg) based on standard gravity, the international foot, and the avoirdupois pound. [3] In other words, at the Earth's surface (in standard gravity), an object with a mass of 1 slug weighs approximately 32.17405 lbf or 143.1173 N. [ 4 ] [ 5 ]
Turns out, the math doesn’t work. He told The Telegraph that spotting a 3-foot eel would be a 1-in-50,000 event in the loch. For an eel that’s about 20 feet or more ― big enough to be ...
In antiquity, systems of measurement were defined locally: the different units might be defined independently according to the length of a king's thumb or the size of his foot, the length of stride, the length of arm, or maybe the weight of water in a keg of specific size, perhaps itself defined in hands and knuckles. The unifying ...