Old glass panes are thicker at the bottom due to glass flow over time

the verdict

REFUTED

the evidence says no

Recorded sources

0 sources for · 2 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Although old glass panes are sometimes thicker at the bottom, scientific consensus and historical manufacturing records show this is due to how the glass was originally made by glassblowers, not because glass slowly flows over time.

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Judged against fact-checker rulings and reference works: claims of this kind are settled by the fact-checking record, not journal abstracts.

Evidence against · 2

Wikipedia: Glass

Recorded source metadata

Wikipedia: Glass. Wikipedia. https://en.wikipedia.org/wiki/Glass

Reference article covering this claim directly

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More against · 1

physics.stackexchange.com: Do glass panes become thicker at the bottom over time?

Recorded source metadata

physics.stackexchange.com: Do glass panes become thicker at the bottom over time?. physics.stackexchange.com. https://physics.stackexchange.com/questions/55829/do-glass-panes-become-thicker-at-the-bottom-over-time

Confirms panes are sometimes thicker at the bottom, but due to manufacturing techniques, not glass flow.

Source citation format

The paper trail · every fact has a biography

first checked31 Jul 2026

judged → REFUTED · 1031 Jul 2026

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