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In science and engineering, the parts-per notation is a set of pseudo-units to describe small values of miscellaneous dimensionless quantities, e.g. mole fraction or mass fraction. Since these fractions are quantity-per-quantity measures, they are pure numbers with no associated units of measurement. Commonly used are parts-per-million (ppm, 10 ...
A fraction is applied to the output unit (if there is only one), or to non-SI units (if using a combination), except that if a precision is also specified, the fraction only applies to the hand unit. {{convert|18.45|in|m|frac=2}} → 18.45 inches ( 1 ⁄ 2 m)
The latter fraction is the best possible rational approximation of π using fewer than five decimal digits in the numerator and denominator. Zu Chongzhi's results surpass the accuracy reached in Hellenistic mathematics, and would remain without improvement for close to a millennium.
4,000 m (4,375 yds) The 4.7 cm KPÚV vz. 38 (Czech: kanón proti útočné vozbě vzor 38) is an anti-tank gun produced by the Škoda Works that saw service in World War II. Originally designed for the Czechoslovak Army, some were also sold to Yugoslavia. A number were appropriated by the Germans after the German occupation of Czechoslovakia in ...
QF 4.5-inch howitzer. 114 x73-86 mm R separate QF. HE shell 16 kg (35 lb) The Ordnance QF 4.5-inch howitzer was the standard British Empire field (or "light") howitzer of the First World War era. It replaced the BL 5-inch howitzer and equipped some 25% of the field artillery. It entered service in 1910 and remained in service through the ...
10,000 yards (9,100 m) at 20°, 12,000 yards (11,000 m) at 24° [note 3] The QF 4.7-inch gun Mks I, II, III, and IV [note 4] were a family of British quick-firing 4.724-inch (120 mm) naval and coast defence guns of the late 1880s and 1890s that served with the navies of various countries. They were also mounted on various wheeled carriages to ...
4.7-inch gun ammunition. The 4.7-inch gun M1906 (initially the M1904) was designed and issued by the United States Army Ordnance Department beginning in 1906, with the first units receiving the weapon in 1911. [1] It was of the field gun type. It was one of very few pre-war US artillery designs selected for wartime production in World War I ...
There are a number of sizes listed below that appear to be quite similar, and while the tolerances of these connectors are typically indicated as ±0.05 or ±0.03 mm by the manufacturers, there is still ambiguity as to whether two sizes differing by only 0.05 mm (or where the specification is only given to the nearest 0.10 mm) warrants listing ...