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  2. Photo print sizes - Wikipedia

    en.wikipedia.org/wiki/Photo_print_sizes

    The alternative Super series, denoted SnR, nR Plus or nR+, has an aspect ratio of 3∶2 (or as close as possible) and thus provides a better fit for standard 135 film (35 mm) at sizes of 8 inches or above. 5R is twice the size of a 2R print, 6R twice the size of a 4R print and S8R twice the size of 6R. 4D/6D is a newer size for most consumer ...

  3. Orders of magnitude (length) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude_(length)

    The centimetre (SI symbol: cm) is a unit of length in the metric system equal to 10 −2 metres (⁠ 1 / 100 ⁠ m = 0.01 m). To help compare different orders of magnitude, this section lists lengths between 10 −2 m and 10 −1 m (1 cm and 1 dm). 1 cm – 10 millimeters; 1 cm – 0.39 inches; 1 cm – edge of a square of area 1 cm 2

  4. Caliber - Wikipedia

    en.wikipedia.org/wiki/Caliber

    The .308 Winchester is measured across the grooves and uses a .308-in diameter (7.82-mm) bullet; the military-specification version is known as 7.62 × 51 mm NATO, so called because the bore diameter measured between the lands is 7.62 mm, and the cartridge has a case 51 mm long.

  5. Template:Convert - Wikipedia

    en.wikipedia.org/wiki/Template:Convert

    Converts measurements to other units. Template parameters [Edit template data] This template prefers inline formatting of parameters. Parameter Description Type Status Value 1 The value to convert. Number required From unit 2 The unit for the provided value. Suggested values km2 m2 cm2 mm2 ha sqmi acre sqyd sqft sqin km m cm mm mi yd ft in kg g mg lb oz m/s km/h mph K C F m3 cm3 mm3 L mL cuft ...

  6. Letter (paper size) - Wikipedia

    en.wikipedia.org/wiki/Letter_(paper_size)

    The Reagan administration made Letter-size paper the norm for US federal forms in the early 1980s; previously, the smaller "official" Government Letter size, 8 by 10.5 inches (203.2 by 266.7 mm) (aspect ratio: 1.3125), was used in government, while 8.5-by-11-inch (215.9 by 279.4 mm) paper was standard in most other offices. [2]

  7. 8 mm caliber - Wikipedia

    en.wikipedia.org/wiki/8_mm_caliber

    This article is missing information about "7.92 mm" Mauser and members of the lineage (besides x33, which is already here). Please expand the article to include this information. Further details may exist on the talk page .

  8. Metric system - Wikipedia

    en.wikipedia.org/wiki/Metric_system

    The metric system is a system of measurement that standardizes a set of base units and a nomenclature for describing ... (cm) metre (m) mass: kilogram (kg) gram (g) tonne

  9. 9×19mm Parabellum - Wikipedia

    en.wikipedia.org/wiki/9×19mm_Parabellum

    R 50 at 25 m (27 yd) means the closest 50 percent of the shot group will all be within a circle of 25 mm (1.0 in) radius at 25 m (27 yd). The 7N21 ( Cyrillic : 7 Н 21) 9×19mm overpressure variant features an armor-piercing bullet and generates a peak pressure of 280 MPa (41,000 psi). [ 36 ]