How can you group the materials …
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Yogita Ingle 6 years, 5 months ago
Hardness: hardness is another property of materials. Some materials are very hard while some are very soft.
Hard: Material which are difficult to compress are called hard, e.g. diamond, stone, wood, steel, etc. Diamond is the hardest natural substance.
Soft: Materials which can be compressed easily are called soft, e.g. chalk, cotton, rubber, etc.
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