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Should there be a mention of the urban legend that glass flows?
"Do Cathedral Glasses Flow?", Am. J. Phys. v66, pp 392-396, May, 1998
http://www.glassnotes.com/WindowPanes.html
http://www.phschool.com/science/science_news/articles/property_glass.html
http://www.maths.adelaide.edu.au/people/ystokes/windows.html
“ | In glass factories, molten glass was poured onto a large cooling table and allowed to spread. The resulting glass is thicker at the location of the pour, located at the center of the large sheet. These sheets were cut into smaller window panes with nonuniform thickness. Modern glass intended for windows is produced as float glass and is very uniform in thickness.
Several other points exemplify the misconception of the "cathedral glass" theory:
|
” |
Polyamorph ( talk) 10:33, 19 December 2009 (UTC)
It is not just about thicker ends of the pane mounted at the bottom, the panes in the house I grew up in were perceptibly molded to the contours of the wood they were mounted in. Obsidian blades, cathedral panes, and telescope lenses are all made of specialized types of glass, and none of them are even particularly close to being the same type as was commonly used in residential windows in the 1920s. Siting 3 examples of cases where something didn't happen proves only that it doesn't happen in those particular cases, not that it can never happen in any case. I don't doubt that there are types of glass that either flow so slowly as to require geological timeframes to be significant, or even that don't flow at all at moderate temperatures, but that's not all glass. 67.162.34.172 ( talk) 04:38, 16 May 2010 (UTC)
ice is a hydrogen bonded molecular crystalline solid Ice is an amorphous solid? Acegikmo1 14:41, 17 Sep 2004 (UTC)
This article suggests that "amorphous solid" and "glass" (in the broad sense) differ in that all glasses are amorphous solids but not all amorphous solids are glasses:
"The terms "glass" and "glassy solid" are sometimes used synonymously with amorphous solid; however, these terms refer specifically to amorphous materials that undergo a glass transition."
Somewhere, either here or at the article on glass transitions (maybe both places) there really needs to be an example of an amorphous solid that is not a glass. If we can't come up with one, the two articles should be merged.
From earlier:
The article is a little confusing because it contains several inconsistent definitions of the word glass. In the first half of the article it refers to a liquid that is cooled below the [glass transition temperature]], but in the second half it refers to common glass
Some liquids have a glass transition temperature that is higher than the melting point. This means that you can create a glass without supercooling the liquids. Therefore the following sentence is wrong
Tg cannot be greater than the melting temperature. Above the melting temperature, the substance is an isotropic liquid with a viscosity well below that of a glass. ---Dan Miller —Preceding unsigned comment added by 67.188.147.13 ( talk) 22:08, 2 December 2007 (UTC)
"Glass is often referred to as a 'super-cooled' liquid.". glass is called a super cooled liquid because of its ability to flow in heating.It is also called a pseudo-solid However it is correct to write that "Some substances can only be cooled below the glass transition temperature if they are supercooled."
One line says that glass is an amorphous ceramic. Is this correct? I have never heard this before and can find no corroboration in the Glass article. Garbagemania ( talk) 02:43, 30 January 2009 (UTC)
An amorphous solid is a solid in which there is no long-range order of the positions of the atoms. (Solids in which there is long-range atomic order are called crystalline solids.)
Should we write "an amorphous solid is a solid in which the position of the atoms is in short-range order without long-range order"? Roscoe x 13:31, 16 Nov 2004 (UTC)
amorphous solids are solids having short range order.
You should be linking here to the explanation on the eutectic reaction. Metallic glasses are most easily formed when working with compositions as close as possible to deep eutectic systems. —Preceding unsigned comment added by 178.198.133.52 ( talk) 21:22, 12 October 2010 (UTC)
This graphic is good, but the caption needs to say which cell(s) are considered amorphous. Loraof ( talk) 16:39, 6 February 2017 (UTC)
The combination of caption and graphic are lacking and do not help someone unless they are already familiar with the concepts. Furthermore, there isn't much related discussion in the text about liquid crystals, or crystals vs. metal for that matter. The source does not have more information. This should be reconsidered in the text, revised, or remove the graphic entirely. 99.224.2.208 ( talk) 03:09, 15 January 2019 (UTC)
There is a move discussion in progress on Talk:Amorphous (album) which affects this page. Please participate on that page and not in this talk page section. Thank you. — RMCD bot 04:06, 1 March 2021 (UTC)
This
level-4 vital article is rated B-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | |||||||||||||||||||||||||||||||
|
This article is substantially duplicated by a piece in an external publication. Please do not flag this article as a copyright violation of the following source:
|
This article links to one or more target anchors that no longer exist.
Please help fix the broken anchors. You can remove this template after fixing the problems. |
Reporting errors |
Should there be a mention of the urban legend that glass flows?
"Do Cathedral Glasses Flow?", Am. J. Phys. v66, pp 392-396, May, 1998
http://www.glassnotes.com/WindowPanes.html
http://www.phschool.com/science/science_news/articles/property_glass.html
http://www.maths.adelaide.edu.au/people/ystokes/windows.html
“ | In glass factories, molten glass was poured onto a large cooling table and allowed to spread. The resulting glass is thicker at the location of the pour, located at the center of the large sheet. These sheets were cut into smaller window panes with nonuniform thickness. Modern glass intended for windows is produced as float glass and is very uniform in thickness.
Several other points exemplify the misconception of the "cathedral glass" theory:
|
” |
Polyamorph ( talk) 10:33, 19 December 2009 (UTC)
It is not just about thicker ends of the pane mounted at the bottom, the panes in the house I grew up in were perceptibly molded to the contours of the wood they were mounted in. Obsidian blades, cathedral panes, and telescope lenses are all made of specialized types of glass, and none of them are even particularly close to being the same type as was commonly used in residential windows in the 1920s. Siting 3 examples of cases where something didn't happen proves only that it doesn't happen in those particular cases, not that it can never happen in any case. I don't doubt that there are types of glass that either flow so slowly as to require geological timeframes to be significant, or even that don't flow at all at moderate temperatures, but that's not all glass. 67.162.34.172 ( talk) 04:38, 16 May 2010 (UTC)
ice is a hydrogen bonded molecular crystalline solid Ice is an amorphous solid? Acegikmo1 14:41, 17 Sep 2004 (UTC)
This article suggests that "amorphous solid" and "glass" (in the broad sense) differ in that all glasses are amorphous solids but not all amorphous solids are glasses:
"The terms "glass" and "glassy solid" are sometimes used synonymously with amorphous solid; however, these terms refer specifically to amorphous materials that undergo a glass transition."
Somewhere, either here or at the article on glass transitions (maybe both places) there really needs to be an example of an amorphous solid that is not a glass. If we can't come up with one, the two articles should be merged.
From earlier:
The article is a little confusing because it contains several inconsistent definitions of the word glass. In the first half of the article it refers to a liquid that is cooled below the [glass transition temperature]], but in the second half it refers to common glass
Some liquids have a glass transition temperature that is higher than the melting point. This means that you can create a glass without supercooling the liquids. Therefore the following sentence is wrong
Tg cannot be greater than the melting temperature. Above the melting temperature, the substance is an isotropic liquid with a viscosity well below that of a glass. ---Dan Miller —Preceding unsigned comment added by 67.188.147.13 ( talk) 22:08, 2 December 2007 (UTC)
"Glass is often referred to as a 'super-cooled' liquid.". glass is called a super cooled liquid because of its ability to flow in heating.It is also called a pseudo-solid However it is correct to write that "Some substances can only be cooled below the glass transition temperature if they are supercooled."
One line says that glass is an amorphous ceramic. Is this correct? I have never heard this before and can find no corroboration in the Glass article. Garbagemania ( talk) 02:43, 30 January 2009 (UTC)
An amorphous solid is a solid in which there is no long-range order of the positions of the atoms. (Solids in which there is long-range atomic order are called crystalline solids.)
Should we write "an amorphous solid is a solid in which the position of the atoms is in short-range order without long-range order"? Roscoe x 13:31, 16 Nov 2004 (UTC)
amorphous solids are solids having short range order.
You should be linking here to the explanation on the eutectic reaction. Metallic glasses are most easily formed when working with compositions as close as possible to deep eutectic systems. —Preceding unsigned comment added by 178.198.133.52 ( talk) 21:22, 12 October 2010 (UTC)
This graphic is good, but the caption needs to say which cell(s) are considered amorphous. Loraof ( talk) 16:39, 6 February 2017 (UTC)
The combination of caption and graphic are lacking and do not help someone unless they are already familiar with the concepts. Furthermore, there isn't much related discussion in the text about liquid crystals, or crystals vs. metal for that matter. The source does not have more information. This should be reconsidered in the text, revised, or remove the graphic entirely. 99.224.2.208 ( talk) 03:09, 15 January 2019 (UTC)
There is a move discussion in progress on Talk:Amorphous (album) which affects this page. Please participate on that page and not in this talk page section. Thank you. — RMCD bot 04:06, 1 March 2021 (UTC)