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The technical or gravitational FPS system [6] or British gravitational system is a coherent variant of the FPS system that is most common among engineers in the United States. It takes the pound-force as a fundamental unit of force instead of the pound as a fundamental unit of mass. In this sub-system, the unit of mass is a derived unit known ...
Units for other physical quantities are derived from this set as needed. In English Engineering Units, the pound-mass and the pound-force are distinct base units, and Newton's Second Law of Motion takes the form = where is the acceleration in ft/s 2 and g c = 32.174 lb·ft/(lbf·s 2).
The first group of metric units are those that are at present defined as units within the International System of Units (SI). In its most restrictive interpretation, this is what may be meant when the term metric unit is used. The unit one (1) is the unit of a quantity of dimension one. It is the neutral element of any system of units. [2]
ALLMS – anchor leg load monitoring system; ALQ – additional living quarters; ALR – acoustic log report; ALT – altered; AM – asset management; aMDEA – activated methyldiethanolamine; AMS – auxiliary measurement service log; auxiliary measurement sonde (temperature) AMSL – above mean sea level; AMI – area of mutual interest
The International System of Units, internationally known by the abbreviation SI (from French Système international d'unités), is the modern form of the metric system and the world's most widely used system of measurement. It is the only system of measurement with official status in nearly every country in the world, employed in science ...
the Danish pound (pund) as 1 ⁄ 62 of the weight of a cubic Rhineland foot of water (499.7 g) the Danish ell (alen) as 2 Rhineland feet (630 mm) Rømer also suggested a pendulum definition for the foot (although this would not be implemented until after his death), and invented an early temperature scale. [4] [5] The metric system was ...
official definition metric equivalent foot (French measure or Paris foot) 12.789 inches: ≈ 32.48 cm arpent, as a measure of length: 180 feet (French measure) ≈ 58.47 m arpent, as a measure of area: 32 400 square feet (French measure) ≈ 3,418.89 m 2: perch, as a measure of length: 18 feet (French measure) ≈ 5.85 m perch, as a measure of area
The Egyptian equivalent of the foot—a measure of four palms or 16 digits—was known as the djeser and has been reconstructed as about 30 cm (11.8 in). The Greek foot (πούς, pous) had a length of 1 / 600 of a stadion, [12] one stadion being about 181.2 m (594 ft); [13] therefore a foot was, at the time, about 302 mm (11.9 in). Its ...