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Define hardness in brief
Short answer
Hardness is the resistance of a material to scratching, abrasion, cutting or indentation. It is measured by Mohs scale for minerals and Brinell, Rockwell, Vickers tests for metals; granite and diamond are hard, lead and gypsum are soft.
Define hardness as a property of materials.
Hardness is the resistance of a material to scratching, abrasion, cutting or indentation (penetration) by another body. It is measured by the Mohs scale (minerals and stone) and by Brinell, Rockwell and Vickers tests (metals). Granite and diamond are hard; lead and gypsum are soft.
✓ Answer checked by Claude Opus 5.5 (high effort)
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