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  2. Armourstone - Wikipedia

    en.wikipedia.org/wiki/Armourstone

    Armourstone is a generic term for broken stone with stone masses between 100 and 10,000 kilograms (220 and 22,050 lb) (very coarse aggregate) that is suitable for use in hydraulic engineering. Dimensions and characteristics for armourstone are laid down in European Standard EN13383. [ 1 ]

  3. Orders of magnitude (mass) - Wikipedia

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

    3.6 × 10 −9 kg Human ovum [32] [44] 2.4 × 10 −9 kg US RDA for vitamin B12 for adults [45] 10 −8: 10 −8 kg: Speculated approximate lower limit of the mass of a primordial black hole: 1.5 × 10 −8 kg: US RDA for vitamin D for adults [46] ~2 × 10 −8 kg Uncertainty in the mass of the International Prototype of the Kilogram (IPK) (± ...

  4. Drag coefficient - Wikipedia

    en.wikipedia.org/wiki/Drag_coefficient

    Drag coefficients in fluids with Reynolds number approximately 10 4 [1] [2] Shapes are depicted with the same projected frontal area. In fluid dynamics, the drag coefficient (commonly denoted as: , or ) is a dimensionless quantity that is used to quantify the drag or resistance of an object in a fluid environment, such as air or water.

  5. Mohs scale - Wikipedia

    en.wikipedia.org/wiki/Mohs_scale

    Mohs hardness kit, containing one specimen of each mineral on the ten-point hardness scale. The Mohs scale (/ m oʊ z / MOHZ) of mineral hardness is a qualitative ordinal scale, from 1 to 10, characterizing scratch resistance of minerals through the ability of harder material to scratch softer material.

  6. Asteroid mining - Wikipedia

    en.wikipedia.org/wiki/Asteroid_mining

    For a 50% return on investment 1,703,000 kg (54,750,000 ozt) of platinum would have to be extracted for every 11,350,000 tons of asteroid ore. This analysis assumes that doubling the supply of platinum to the market (5.13 million ounces in 2014) would have no effect on the price of platinum.

  7. Sri Lankan units of measurement - Wikipedia

    en.wikipedia.org/wiki/Sri_Lankan_units_of...

    32374.9 m 2 (8 acres) In a stone inscription written by King Bhathikabhaya Abhaya at Dunumadalakanda in Anuradhapura District, ... was equal to 226.8 kg, [1] ...

  8. Brian Shaw (strongman) - Wikipedia

    en.wikipedia.org/wiki/Brian_Shaw_(strongman)

    Brian Shaw (born February 26, 1982) is an American retired professional strongman who is widely regarded as one of the greatest strength athletes of all time. [7] He won the 2011, 2013, 2015, and 2016 World's Strongest Man, making him one of only five men to win the World’s Strongest Man four times or more.

  9. Gravitational acceleration - Wikipedia

    en.wikipedia.org/wiki/Gravitational_acceleration

    [2] [3] At different points on Earth's surface, the free fall acceleration ranges from 9.764 to 9.834 m/s 2 (32.03 to 32.26 ft/s 2), [4] depending on altitude, latitude, and longitude. A conventional standard value is defined exactly as 9.80665 m/s² (about 32.1740 ft/s²).