Is Glass a Liquid?
4. Liquid Panes?
Another thing that you might have noticed about some old buildings is that the parts of the structure are quite different from that of modern buildings. This is because techniques and materials have changed over the years. You might also notice that panes of glass might have the appearance of have flowed downwards over time.
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This has led some people to speculate that glass is actually a very slow-moving liquid and that it takes generations to see this flow in effect. The reality is that methods were simply different then, resulting in glass that was more rippled, unlike the flat glass sheets of today.
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