How would a salt and water solution clean a penny but a vinegar and salt solution will not clean a penny?


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What is or what characterize the thermodynamic state of metal (structure of metal)?

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For the same part, it is possible to Specify the two different type of Hardness with same scall(EX-Quenching and tempering==>450 to 500HV30 & Hardening and Austempering 330- 380HV30)

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