Bramblethorn
Sleep-deprived
- Joined
- Feb 16, 2012
- Posts
- 18,318
Richard Feynman, the physicist, had genius for depicting complex events as simple imagery. At the CHALLENGER inquiry he stopped the circus when he put an O-ring in ice water, swizzled it, then took the o-ring from the ice water and snapped it in half, to demonstrate how the o-ring reacted with intense cold.
Quite a few people tell the story of Feynman snapping or even "shattering" a hammer, but that's not what happened. He bent a small O-ring in a clamp and chilled it; the point of the demonstration was that when he unclamped it, it didn't spring back quickly (which stopped it from closing a seal, leading to Very Bad Things). Still a good demonstration, though.
I suspect the "snapped"/"shattered" stories come from people conflating Feynman's demonstration with a popular physics demo. If you chill rubber in liquid nitrogen, you can indeed snap it pretty easily, but Feynman's ice water wasn't that cold.