Which member of the Rogers Commission publicly demonstrated the O-ring failure mechanism using a glass of ice water?

Answer

Richard Feynman

Physicist Richard Feynman, serving as a member of the Presidential Commission on the Space Shuttle Challenger Accident (Rogers Commission), provided a stark and tangible demonstration of the cause of the failure. He illustrated the loss of resiliency in the O-ring material by submerging a sample piece in a glass of ice water. This action effectively showed how the material became inflexible in the launch day's low temperatures, preventing it from sealing the SRB joint as intended, thus clarifying the direct link between the weather conditions and the ensuing technical failure for the commission.

Which member of the Rogers Commission publicly demonstrated the O-ring failure mechanism using a glass of ice water?
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