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  2. Relative density - Wikipedia

    en.wikipedia.org/wiki/Relative_density

    A United States Navy Aviation boatswain's mate tests the specific gravity of JP-5 fuel. Relative density, also called specific gravity, [1] [2] is a dimensionless quantity defined as the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material.

  3. Concrete - Wikipedia

    en.wikipedia.org/wiki/Concrete

    The placement consisted of 10,251 cubic yards of concrete placed in 58.5 hours using two concrete pumps and two dedicated concrete batch plants. Upon curing, this placement allows the 50,180-square-foot (4,662 m 2 ) cofferdam to be dewatered approximately 26 feet (7.9 m) below sea level to allow the construction of the Inner Harbor Navigation ...

  4. Portland cement - Wikipedia

    en.wikipedia.org/wiki/Portland_cement

    The most common use for portland cement is in the production of concrete. [17] Concrete is a composite material consisting of aggregate (gravel and sand), cement, and water. As a construction material, concrete can be cast in almost any shape desired, and once hardened, can become a structural (load bearing) element.

  5. Calcium aluminate cements - Wikipedia

    en.wikipedia.org/wiki/Calcium_aluminate_cements

    By the 2010s, the product was found in the US market under the name FONDAG cement (FOND Aluminous Aggregate), sometimes referred to as ALAG (ALuminous AGgregate). FONDAG cement is a mix of up to 40 percent alumina, and is stable at high temperatures and thermal cycling from −184–1,093 °C (−300–2,000 °F; 89–1,400 K; 160–2,500 °R ...

  6. Ice - Wikipedia

    en.wikipedia.org/wiki/Ice

    Ice from a theorized superionic water may possess two crystalline structures. At pressures in excess of 500,000 bars (7,300,000 psi) such superionic ice would take on a body-centered cubic structure. However, at pressures in excess of 1,000,000 bars (15,000,000 psi) the structure may shift to a more stable face-centered cubic lattice. It is ...

  7. Wikipedia:Reference desk/Archives/Science/December 2005 ...

    en.wikipedia.org/wiki/Wikipedia:Reference_desk/...

    If there are too many protons, some can turn into neutrons by beta decay, and vice versa. A proton can change into a neutron by emitting a positron (beta plus), and a neutron can change into a proton by emitting an electron (beta minus). —Keenan Pepper 03:59, 1 December 2005 (UTC) THE SUN DOES NOT EXIST!!!!!

  8. Water - Wikipedia

    en.wikipedia.org/wiki/Water

    Earth's approximate water volume (the total water supply of the world) is 1.386 billion cubic kilometres (333 million cubic miles). [24] Liquid water is found in bodies of water, such as an ocean, sea, lake, river, stream, canal, pond, or puddle. The majority of water on Earth is seawater. Water is also present in the atmosphere in solid ...

  9. Bituminous coal - Wikipedia

    en.wikipedia.org/wiki/Bituminous_coal

    Bituminous coal. Bituminous coal, or black coal, is a type of coal containing a tar-like substance called bitumen or asphalt. Its coloration can be black or sometimes dark brown; often there are well-defined bands of bright and dull material within the seams.

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