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In ancient Rome, according to Vitruvius, a cubit was equal to 1 + 1 ⁄ 2 Roman feet or 6 palm widths (approximately 444 mm or 17 + 1 ⁄ 2 in). [23] A 120-centimetre cubit (approximately four feet long), called the Roman ulna, was common in the Roman empire, which cubit was measured from the fingers of the outstretched arm opposite the man's hip.
The IEEE symbol for the cubic foot per second is ft 3 /s. [1] The following other abbreviations are also sometimes used: ft 3 /sec; cu ft/s; cfs or CFS; cusec; second-feet; The flow or discharge of rivers, i.e., the volume of water passing a location per unit of time, is commonly expressed in units of cubic feet per second or cubic metres per second.
For petroleum gases, the standard cubic foot (scf) is defined as one cubic foot of gas at 60 °F (288.7 K; 15.56 °C) and at normal sea level air pressure. The pressure definition differs between sources, but are all close to normal sea level air pressure. A pressure of 14.696 pounds per square inch (1.00000 atm; 101.325 kPa). [2]
foot: 1 pes 296 mm 0.971 ft sometimes distinguished as the pes monetalis [a] palmipes foot and a palm 1 + 1 ⁄ 4 pedes 370 mm 1.214 ft cubitum cubit: 1 + 1 ⁄ 2 pedes 444 mm 1.456 ft gradus pes sestertius step: 2 + 1 ⁄ 2 pedes 0.74 m 2.427 ft passus pace: 5 pedes 1.48 m 4.854 ft decempeda pertica: perch: 10 pedes 2.96 m 9.708 ft
The biblical ell is closely related to the cubit, but two different factors are given in the Bible; Ezekiel's measurements imply that the ell was equal to 1 cubit plus 1 palm (Tefah), [6] [7] while elsewhere in the Bible, the ell is equated with 1 cubit exactly.
This translates to a hoppus foot being equal to 1.273 cubic feet (2,200 in 3; 0.0360 m 3). The hoppus board foot, when milled, yields about one board foot. The volume yielded by the quarter-girth formula is 78.54% of cubic measure (i.e. 1 ft 3 = 0.7854 h ft; 1 h ft = 1.273 ft 3). [45]
One cubit was equal to 0.464 m (18.5 in). [2] The Bam̆ba (Fathom), still in use as of 2016, is the distance between a man's outstretched arms. It is roughly 6 feet in length.
Historic standard units of the city of Regensburg: from left to right, a fathom (Klafter), foot (Schuch) and ell (Öln). Prussian ell. An ell (from Proto-Germanic *alinō, cognate with Latin ulna) [1] is a northwestern European unit of measurement, originally understood as a cubit (the combined length of the forearm and extended hand).