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Which one of the following best defines hardness: (a) energy absorbed by a material when an object strikes its surface, (b) resistance to bending, (c) resistance to permanent in…

Which one of the following best defines hardness: (a) energy absorbed by a material when an object strikes its surface, (b) resistance to bending, (c) resistance to permanent in…
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Which one of the following best defines hardness: (a) energy absorbed by a material when an object strikes its surface, (b) resistance to bending, (c) resistance to permanent indentation, or (d) resistance to scratching

User XMarshall
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Resistance to permanent indentation

User Daniel Poirot
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