how can we tell if a material is hard?
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By carrying out the Brinell test ...
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24
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hii mate....
Well known hard materials include diamond and hardened high carbon steels. Same units as for tensile strength. The methods used for testing hardness are the Brinell test which uses a hardened steel ball and produces a hardness number HB which can be used to compare the hardness of materials.. . ..
hope it helps you....
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