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  2. Orders of magnitude (length) - Wikipedia

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

    To help compare different orders of magnitude, this section lists lengths between 10 −2 m and 101 m (1 cm and 1 dm). 1 cm10 millimeters; 1 cm – 0.39 inches; 1 cm – edge of a square of area 1 cm 2; 1 cm – edge of a cube of volume 1 mL; 1 cm – length of a coffee bean; 1 cm – approximate width of average fingernail

  3. 7.5 cm KwK 42 - Wikipedia

    en.wikipedia.org/wiki/7.5_cm_KwK_42

    The 7.5 cm KwK 42 L/70 (from 7.5 cm Kampfwagenkanone 42 L/70) was a 7.5 cm calibre German tank gun used on German armoured fighting vehicles in the Second World War. The gun was the armament of the Panther medium tank and two variants of the Jagdpanzer IV self-propelled anti-tank gun .

  4. Angstrom - Wikipedia

    en.wikipedia.org/wiki/Angstrom

    An example is Bragg's 1921 classical paper on the structure of ice, [11] which gives the c- and a-axis lattice constants as 4.52 A.U. and 7.34 A.U., respectively. Ambiguously, the abbreviation "a.u." may also refer to the atomic unit of length, the bohr—about 0.53 Å—or the much larger astronomical unit (about 1.5 × 10 11 m). [27] [28] [29]

  5. El Castillo, Chichen Itza - Wikipedia

    en.wikipedia.org/wiki/El_Castillo,_Chichen_Itza

    The forming sinkhole beneath the temple is approximately 82 by 114 feet (25 by 35 meters) and as many as 65 feet (20 meters) deep. The water filling the cavern is thought to run from north to south. They also found a layer of limestone approximately 16 feet (4.9 meters) thick at the top of the cenote, upon which the temple sits.

  6. Astronomical unit - Wikipedia

    en.wikipedia.org/wiki/Astronomical_unit

    Distance of the outer limit of Oort cloud from the Sun (estimated, corresponds to 1.2 light-years) — Parsec: 206 265 — One parsec. The parsec is defined in terms of the astronomical unit, is used to measure distances beyond the scope of the Solar System and is about 3.26 light-years: 1 pc = 1 au/tan(1″) [6] [61] Proxima Centauri: 268 000 ...

  7. Vietnamese units of measurement - Wikipedia

    en.wikipedia.org/wiki/Vietnamese_units_of...

    Originally, many thước of varying lengths were in use in Vietnam, each used for different purposes. According to Hoàng Phê (1988), [1] the traditional system of units had at least two thước of different lengths before 1890, [2] the thước ta (lit. "our ruler") or thước mộc ("wooden ruler"), equal to 0.425 metres (1 ft 4.7 in), and the thước đo vải ("ruler for measuring ...

  8. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    There are many areas of mathematics, which include number theory (the study of numbers), algebra (the study of formulas and related structures), geometry (the study of shapes and spaces that contain them), analysis (the study of continuous changes), and set theory (presently used as a foundation for all mathematics).

  9. Pandanus - Wikipedia

    en.wikipedia.org/wiki/Pandanus

    The top of the plant has one or more crowns of strap-shaped leaves that may be spiny, [2] [3] varying between species from 30 centimetres (12 inches) to 2 m (6 + 1 ⁄ 2 ft) or longer, and from 1.5 cm (5 ⁄ 8 in) up to 10 cm (4 in) broad. They are dioecious, with male and female flowers produced on different plants.