![]() ![]() The scientists-including ACerS members Ozgur Gulbiten and John Mauro, now at Penn State University-used medieval glass windows in Westminster Abbey from 1268 AD as the basis for their calculations. Their results indicate the highest ever direct measurement of glass viscosity at low temperatures. The team combined glass transition theory and experimental characterization techniques, which, the scientists report, had astounding agreement. ![]() Glass scientists, including ACerS Fellow Edgar Zanotto, have previously shattered the flowing glass window legend.īut recent advances have now allowed glass scientists at Corning to take another closer look at this urban legend by calculating the rate of glass flow in medieval windows. I remember being astonished by this fact as a child-how could something that seems so physically solid actually be more like a liquid? It was an important early lesson to a curious mind that some things are not always as they seem.Īlthough today, that lesson applies itself to that very legend that taught it. Old windows, my teacher explained, are measurably thicker at the bottom than at the top. Like many other students, I remember being taught during my early education that glass-because the material is somewhere in between liquid and glass states-is actually flowing, ever so slowly. ![]()
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