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  2. The Sand Reckoner - Wikipedia

    en.wikipedia.org/wiki/The_Sand_Reckoner

    The Sand Reckoner (Greek: Ψαμμίτης, Psammites) is a work by Archimedes, an Ancient Greek mathematician of the 3rd century BC, in which he set out to determine an upper bound for the number of grains of sand that fit into the universe. In order to do this, Archimedes had to estimate the size of the universe according to the contemporary ...

  3. Stepped reckoner - Wikipedia

    en.wikipedia.org/wiki/Stepped_reckoner

    The stepped reckoner or Leibniz calculator was a mechanical calculator invented by the German mathematician Gottfried Wilhelm Leibniz (started in 1673, when he presented a wooden model to the Royal Society of London [2] and completed in 1694). [1] The name comes from the translation of the German term for its operating mechanism, Staffelwalze ...

  4. Pore water pressure - Wikipedia

    en.wikipedia.org/wiki/Pore_water_pressure

    Pore water pressure (sometimes abbreviated to pwp) refers to the pressure of groundwater held within a soil or rock, in gaps between particles (pores). Pore water pressures below the phreatic level of the groundwater are measured with piezometers. The vertical pore water pressure distribution in aquifers can generally be assumed to be close to ...

  5. Concrete degradation - Wikipedia

    en.wikipedia.org/wiki/Concrete_degradation

    Concrete degradation may have many different causes. Concrete is mostly damaged by the corrosion of reinforcement bars due to the carbonatation of hardened cement paste or chloride attack under wet conditions. Chemical damage is caused by the formation of expansive products produced by chemical reactions (from carbonatation, chlorides, sulfates ...

  6. Atterberg limits - Wikipedia

    en.wikipedia.org/wiki/Atterberg_limits

    The Atterberg limits are a basic measure of the critical water contents of a fine-grained soil: its shrinkage limit, plastic limit, and liquid limit. Depending on its water content, soil may appear in one of four states: solid, semi-solid, plastic and liquid. In each state, the consistency and behavior of soil are different, and consequently so ...

  7. Geodesic dome - Wikipedia

    en.wikipedia.org/wiki/Geodesic_dome

    Geodesic dome. A geodesic dome is a hemispherical thin-shell structure (lattice-shell) based on a geodesic polyhedron. The rigid triangular elements of the dome distribute stress throughout the structure, making geodesic domes able to withstand very heavy loads for their size.

  8. Orders of magnitude (volume) - Wikipedia

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

    Volume of concrete in the Three Gorges Dam, the world's largest concrete structure 4.3 × 10 7: Volume of Aswan Dam: 9 × 10 7: Volume of gas required per day by India in 2005 1.01 × 10 8: Volume of the Grimsel reservoir: 1.73 × 10 8: Volume of Lake Baldegg, Switzerland 2.05 × 10 8: Volume of material excavated in the construction of the ...

  9. Chernobyl disaster - Wikipedia

    en.wikipedia.org/wiki/Chernobyl_disaster

    It was composed of melted sand, concrete, and a large amount of nuclear fuel that had escaped from the reactor. The concrete beneath the reactor was steaming hot, and was breached by now-solidified lava and spectacular unknown crystalline forms termed chernobylite .

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