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TIL that glass is neither a liquid nor a solid, but rather a state that exists between the two called "amorphous solid".

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level 1
[deleted]
1 point · 1 year ago

isnt old (REALLY OLD) glass thicker at the bottom of the pane because it flows downward?

level 2
10 points · 1 year ago

If I remember right that's a load of bunk and older glass is like that as a result of how panes of glass used to be manufactured

level 3

You're correct. Molten glass was poured onto a spinning disc, which was scored and cut with the outermost edges being used at the base of windows.

level 3

Might even have something to do with them being purposely built that way for strength?

level 2

From techniques I've seen, glass panes were blown glass bubbles shaped into glass cylinders. They were opened at the top of the bubble and then knocked off a blow pipe, thereby opening the bottom. Then the glass blower cuts the cylinder on one side and puts it back into a furnace where it slumps open. The reason it would be thicker at one end is because the part of the glass bubble that is originally closest to the pipe is naturally thicker than the top due to the glass blowing process.

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