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The Knoop hardness number(KHN) is defined as the applied load divided by the unrecovered projected area of the indentation.

The Knoop hardness number(KHN) is defined as the applied load divided by the unrecovered projected area of the indentation. Correct Answer True

KHN = P/AP; where the P is applied the load, and the AP is the unrecovered projected area of indentation. -> P/L2C; Where L is the length of the long diagonal, C is a constant of the indenter.

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