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  1. The Prandtl number ( Pr) or Prandtl group is a dimensionless number, named after the German physicist Ludwig Prandtl, defined as the ratio of momentum diffusivity to thermal diffusivity. [1] The Prandtl number is given as: where: ν {\displaystyle \nu } : momentum diffusivity ( kinematic viscosity ),

  2. en.wikipedia.org › wiki › MoonMoon - Wikipedia

    The Moon is Earth's only natural satellite. It orbits at an average distance of 384,400 km (238,900 mi), about 30 times the diameter of Earth. Over time Earth's gravity has caused tidal locking, causing the same side of the Moon to always face Earth. Because of this, the lunar day and the lunar month are the same length, at 29.5 Earth days ...

  3. The Castle of Rocca Calascio is a mountaintop fortress or rocca in the municipality of Calascio, in the Province of L'Aquila, Abruzzo, Italy. At an elevation of around 1,460 metres (4,790 ft), the castle is the highest fortress in the Apennines. Built of stone and masonry exclusively for military purposes and intended only to accommodate troops ...

  4. en.wikipedia.org › wiki › Mao_ZedongMao Zedong - Wikipedia

    Mao Zedong [a] (26 December 1893 – 9 September 1976) was a Chinese politician, Marxist theorist, military strategist, poet, and revolutionary who was the founder of the People's Republic of China (PRC). He led the country from its establishment in 1949 until his death in 1976, while also serving as the chairman of the Chinese Communist Party ...

  5. en.wikipedia.org › wiki › FC_BarcelonaFC Barcelona - Wikipedia

    Futbol Club Barcelona (Catalan pronunciation: [fubˈbɔl ˈklub bəɾsəˈlonə] ⓘ), commonly known as Barcelona and familiarly as Barça ([ˈbaɾsə]), is a professional football club based in Barcelona, Catalonia, Spain, that competes in La Liga, the top flight of Spanish football. Founded in 1899 by a group of Swiss, Catalan, German, and ...

  6. en.wikipedia.org › wiki › Karl_MarxKarl Marx - Wikipedia

    Karl Marx (German:; 5 May 1818 – 14 March 1883) was a German-born philosopher, economist, political theorist, historian, sociologist, journalist, and revolutionary socialist.His best-known works are the 1848 pamphlet The Communist Manifesto (with Friedrich Engels) and the three-volume Das Kapital (1867–1894); the latter employs his critical approach of historical materialism in an analysis ...

  7. en.wikipedia.org › wiki › Generation_ZGeneration Z - Wikipedia

    Etymology and nomenclature The name Generation Z is a reference to the fact that it is the second generation after Generation X, continuing the alphabetical sequence from Generation Y (Millennials). Other proposed names for the generation included iGeneration, Homeland Generation, Net Gen, Digital Natives, Neo-Digital Natives, Pluralist Generation, Internet Generation, Centennials, and Post ...