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  2. Trinitite - Wikipedia

    en.wikipedia.org/wiki/Trinitite

    An estimated 4,300 gigajoules (4.3 × 10 19 erg) of heat energy went into forming the glass. As the temperature required to melt the sand into the observed glass form was about 1,470 °C (2,680 °F), this was estimated to have been the minimum temperature the sand was exposed to. [16]

  3. Vitrified sand - Wikipedia

    en.wikipedia.org/wiki/Vitrified_sand

    Vitrified sand is sand that has been heated to a high enough temperature to undergo vitrification, which is the melting of the silicon dioxide or quartz that compose common sand. Vitrified sand is a type of natural glass, contrasted with manufactured glass in which soda ash or potash are added to lower the melting point. Pure quartz melts at ...

  4. Vitrification - Wikipedia

    en.wikipedia.org/wiki/Vitrification

    Vitrification (from Latin vitrum 'glass', via French vitrifier) is the full or partial transformation of a substance into a glass, [1] that is to say, a non-crystalline or amorphous solid. Glasses differ from liquids structurally and glasses possess a higher degree of connectivity with the same Hausdorff dimensionality of bonds as crystals: dim ...

  5. Glass casting - Wikipedia

    en.wikipedia.org/wiki/Glass_casting

    Glass casting is the process in which glass objects are cast by directing molten glass into a mould where it solidifies. The technique has been used since the 15th century BCE in both Ancient Egypt and Mesopotamia. Modern cast glass is formed by a variety of processes such as kiln casting or casting into sand, graphite or metal moulds.

  6. Volcanic glass - Wikipedia

    en.wikipedia.org/wiki/Volcanic_glass

    The change from supercooled liquid to glass occurs at a temperature called the glass transition temperature, which depends on both cooling rate and the amount of water dissolved in the magma. Magma rich in silica and poor in dissolved water is most easily cooled rapidly enough to form volcanic glass.

  7. Slumping - Wikipedia

    en.wikipedia.org/wiki/Slumping

    Slumping glass is a highly technical operation that is subject to many variations, both controlled and uncontrolled. When an item is being slumped in a kiln, the mold over which it is being formed (which can be made of either ceramic, sand or metal) must be coated with a release agent that will stop the molten glass from sticking to the mold.

  8. Michelle Obama Skips Jimmy Carter's Funeral and Is 'Still in ...

    www.aol.com/michelle-obama-skips-jimmy-carters...

    The former first lady was notably absent from President Jimmy Carter's state funeral service, leading Barack Obama and Donald Trump to be seated next to one another

  9. Flory–Fox equation - Wikipedia

    en.wikipedia.org/wiki/Flory–Fox_equation

    The Flory–Fox equation relates the number-average molecular weight, M n, to the glass transition temperature, T g, as shown below: =, where T g,∞ is the maximum glass transition temperature that can be achieved at a theoretical infinite molecular weight and K is an empirical parameter that is related to the free volume present in the polymer sample.

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