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How much heat energy in molten glass?

  1. Dec 25, 2014 #1
    How much heat energy is in a cubic meter of molten glass?

    I would like to know how much energy would be lost if a cubic meter of glass would be allowed to cool, instead of turning the energy into something else.
     
  2. jcsd
  3. Dec 25, 2014 #2
  4. Dec 25, 2014 #3
    Thank you =)
     
  5. Dec 28, 2014 #4

    CWatters

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    Does glass have a latent heat of fusion/melting? Just wondering.
     
  6. Dec 28, 2014 #5

    Doug Huffman

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    Hmm, I seem to recall glass characterized as a very viscous amorphous liquid, thus no phase change on solidification.

     
    Last edited: Dec 28, 2014
  7. Dec 28, 2014 #6

    Vanadium 50

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    It does not. (But the "glass is a liquid" meme is an oversimplification designed more to produce a 'wow' than actual enlightenment)
     
  8. Dec 28, 2014 #7

    sophiecentaur

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    Also, there is a belief that the glass in old windows is thicker at the bottom than at the top because it has 'flowed downwards'. I think the reason is not to do with flowing but because the glass was always put in that way for strength.
     
  9. Dec 28, 2014 #8

    Doug Huffman

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    All that is made clear in John Baez' article, the 'simplification' (of one only order phase transition) and mass orientation ("The sheets were thicker towards the edge of the disc and were usually installed with the heavier side at the bottom.").

    But for strength?
     
  10. Dec 29, 2014 #9

    sophiecentaur

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    [QUOTE="Doug Huffman, post: 4958953, member: 106968"
    But for strength?/QUOTE]
    Strength for two reasons. Handling is safer if you are holding the pane up to the space and shifting the pane around when it's resting on the ledge would de less risky.
    Otoh it could be just cosmetic and putting the clearest bit up in the sky direction.
     
    Last edited: Dec 29, 2014
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