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REPORT ABUSIVE REPLY
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Anonymous Coward |
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Yeah, they say the same about glass, that the molecules are in motion and it's basically dripping down itself constantly, it's just that it supposedly takes 10,000 years or something to actually happen.
Quoting: Anonymous Coward 27636366 No we don't. There is absolutaly no evidence that glass droops with time. If it where the case microscopes and other technology using glass would not work. It is an urban myth unsupported by evidence. Correction, the windows in very old churches have thicker glass at the bottom, where its drooped down over time. So i was told in school anyway. The 'fluidity' of glass is some-what of a myth. Glass is a quazi-fluid in that the molecules of glass are not strictly organized into a crystal structure, they are not completely random like a true (idealized) fluid, the structure of glass is an interesting subject. I believe that the thickness variations of the glass in old windows is related to how they were made, and not due to the supposed flow of the glass. At normal temperatures I believe glass does not flow per se, however some changes must occur over time. I have bought very fresh panes of glass for putting into windows. When I cut the fresh glass, all it takes is the score line and a nice snap, breaks very clean. Old glass, or even older glass as in 10 years or more, does not break nearly as cleanly and requires a much deeper score line to get a clean cut. So there is something going on there but what exactly I dont know.
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