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Old May 5, 2012, 02:56 PM   #17
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Join Date: September 8, 2007
Location: Mississippi
Posts: 14,495
Given what happens to metal when it expands through heat, wouldn't any openings in the surface of the metal (pores, fissures, cracks, etc.) CLOSE, not open?
Expanding metal would make the pores bigger. Contracting metal makes them smaller.
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