Why glass is a liquid pretending to be a solid

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Why glass is a liquid pretending to be a solid

Elias Voss · Sep 18, 2026 · 5 min read

Ask a physicist and they'll argue for days. Ask a glassblower and the answer is simple: glass is a liquid that got tired of moving.

It never fully stops

Glass is an amorphous solid — it flows so slowly that a cathedral window will sag on a timescale measured in centuries, not years. It holds a shape because we froze it before it finished.

That's the whole craft

Every piece we make is a snapshot of a liquid, caught mid-motion and cooled fast enough to stay. The annealer is just the part where we let it finish stopping on its own.