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Knoop Hardness Number
KHN
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Definition: A measure of hardness employing a diamond pyramid indentor. The measure of hardness known as the Knoop hardness number (KHN) is obtained by the formula:< >
KHN = 14.2 P/L2

where

P = the load
L = the length of indentation
Definition Copyright ©1989 CRC Press LLC. All rights reserved.

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