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A unit of measurement, or unit of measure, is a definite magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity. [1] Any other quantity of that kind can be expressed as a multiple of the unit of measurement. [2] For example, a length is a physical quantity.
Egyptian units of length are attested from the Early Dynastic Period. Although it dates to the 5th dynasty, the Palermo stone recorded the level of the Nile River during the reign of the Early Dynastic pharaoh Djer, when the height of the Nile was recorded as 6 cubits and 1 palm [1] (about 3.217 m or 10 ft 6.7 in).
However, lenses are marked in terms of focal length in millimeters (e.g., average natural human field of view is a lens with 35–50 mm focal length for 35 mm film). The weight of vinyl phonograph records is reported in grams. [58] The tracking force and anti-skating settings on a turntable are measured in grams-force. [59]
It has a curb weight of 4,950 lb (2,250 kg) and a payload of 1,250 lb (570 kg); the estimated driving range is 50 mi (80 km) and the maximum speed is 60 mph (97 km/h). Testing at EVTC showed the ECRV met or exceeded its performance requirements, including an accelerated 20,000 mi (32,000 km) reliability test. [ 29 ]
The 1977 Delta 88s and other GM B-body cars were considerably downsized from their predecessors in length and wheelbase (116 in (2,900 mm) – the same as the four-door 1973–77 A-body Cutlass Sedan) and nearly 900 lb (410 kg) lighter in weight, with curb weights dropping to between 3,500 and 3,600 lb (1,590 and 1,630 kg) depending on model. [20]
Wing loading: 767 kg/m 2 (157 lb/sq ft) Thrust/weight: 0.77; Armament. Guns: 1 × 27 mm (1.06 in) Mauser BK-27 revolver cannon internally mounted under starboard side of fuselage with 180 rounds [d] Hardpoints: 3 × under-fuselage and 4 × under-wing pylon stations [e] with a capacity of 9,000 kg (19,800 lb), with provisions to carry ...
Two new prototype hulls and three turrets were shipped to the US: PT20 mounting a 105 mm (4.1 in) rifled L7 gun and a Hughes fire control system, PT19 with the same fire control system but able to swap out the gun for the 120 mm (4.7 in) Rheinmetall smoothbore gun, and the PT21 fitted with the Krupp Atlas Elektronik EMES-13 fire control system ...
The BMW E30 is the second generation of BMW 3 Series, which was produced from 1982 to 1994 and replaced the E21 3 Series.The model range included 2-door saloon (sometimes referred to as a coupé) and convertible body styles, [4] [5] as well as being the first 3 Series to be produced in 4-door saloon and wagon/estate body styles.