Can copper be scratched by a fingernail or blade knife. why?

asked Jul 13, 2021 232k views

3 votes

by Mahes

4.8k points

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1 vote

Answer:

it could by blade knife

Step-by-step explanation:

fingernail has hardness 2.5; copper penny, about 3.5; a knife blade, 5.5

Hoaphumanoid answered Jul 17, 2021

4.7k points

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