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  2. Hydraulic jumps in rectangular channels - Wikipedia

    en.wikipedia.org/wiki/Hydraulic_Jumps_in...

    Hydraulic jump in a rectangular channel, also known as classical jump, is a natural phenomenon that occurs whenever flow changes from supercritical to subcritical flow. In this transition, the water surface rises abruptly, surface rollers are formed, intense mixing occurs, air is entrained, and often a large amount of energy is dissipated.

  3. Abacus - Wikipedia

    en.wikipedia.org/wiki/Abacus

    Bi-quinary coded decimal-like abacus representing 1,352,964,708. An abacus (pl.: abaci or abacuses), also called a counting frame, is a hand-operated calculating tool which was used from ancient times in the ancient Near East, Europe, China, and Russia, until the adoption of the Hindu–Arabic numeral system. [1]

  4. List of countries in the Americas by life expectancy - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_in_the...

    All calculations are based on raw data; so due to the nuances of rounding, in some places illusory inconsistencies of indicators arose, with a size of 0.01 year. In 2014, some of the world's leading countries had a local peak in life expectancy, so this year is chosen for comparison with 2019 and 2022.

  5. Antikythera mechanism - Wikipedia

    en.wikipedia.org/wiki/Antikythera_mechanism

    Derek J. de Solla Price (1922–1983) with a model of the Antikythera mechanism. Captain Dimitrios Kontos (Δημήτριος Κοντός) and a crew of sponge divers from Symi island discovered the Antikythera wreck in early 1900, and recovered artefacts during the first expedition with the Hellenic Royal Navy, in 1900–01. [32]

  6. List of countries by past and projected future population

    en.wikipedia.org/wiki/List_of_countries_by_past...

    The national 1 July, mid-year population estimates (usually based on past national censuses) supplied in these tables are given in thousands. The retrospective figures use the present-day names and world political division: for example, the table gives data for each of the 15 republics of the former Soviet Union, as if they had already been independent in 1950.

  7. Rebar - Wikipedia

    en.wikipedia.org/wiki/Rebar

    The diameter of the equivalent large format round shape is rounded to the nearest 1 ⁄ 8 inch to provide the bar size. For example, #9 bar has a cross section of 1.00 square inch (6.5 cm 2 ), and therefore a diameter of 1.128 inches (28.7 mm). #10, #11, #14, and #18 sizes correspond to 1 1 ⁄ 8 inch, 1 1 ⁄ 4 , 1 1 ⁄ 2 , and 2-inch square ...

  8. Motor vehicle fatality rate in U.S. by year - Wikipedia

    en.wikipedia.org/wiki/Motor_vehicle_fatality...

    Year Deaths VMT– Vehicle miles traveled (billions) Fatalities per 100 million VMT Population Fatalities per 100,000 population Change in per capita fatalities from previous year

  9. Toronto - Wikipedia

    en.wikipedia.org/wiki/Toronto

    The denser urbanscape makes for warmer nights year-round; the average nighttime temperature is about 3.0 °C (5.4 °F) warmer in the city than in rural areas in all months. [131] However, it can be noticeably cooler on many spring and early summer afternoons under the influence of a lake breeze, since Lake Ontario is cool relative to the air ...