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What causes the popping or tinkling sounds as hot metal pipes cool off?
Patwoods
The sound actually emanates from breaking atomic bonds, and the subsequent rearrangement of the crystalline matrix within grains. This change occurs so quickly, that the material produces a pressure wave (sound wave) that you can hear as a popping sound.
Pretty cool, huh!?
Source: B.S. in Material Science and Engineering from The Georgia Institute of Technology
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∙ 11y ago
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