Hardness

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Hardness is a measure of how hard a material is. Hard things resist pressure. Some examples of hard materials are diamond, carbides, quartz, tempered steel, ice, granite, concrete.

Harder materials are more difficult to cut and shape than softer ones. They are also usually more brittle which means they do not bend much but can shatter. Hard materials are important in industry. Cutting tools, machines and construction materials are usually hard.

The Mohs scale of mineral hardness is a scratch test of how hard minerals are. Compression tests and rebound tests are more used for metals and artificial materials.



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