differenciate between hard and soft material

THE DIFFERENCE BETWEEN HARD& SOFT MATERIALS ARE SOFT MATERIALS CAN BE PRESSED AND SCRATCHED BUT HARD MATERIALS CANNOT BE SCRATCHED AND PRESSED 

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      soft substances can be stretched but hard substances or not
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soft substancs can be stretched but hard substances can be not.
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Hard materials : materails shape cannot be changed by applying force. ex : wood,stone,diamond etc.
soft materials : materials shape can be altered easily, ex : cotton , songe etc.

these differences are mainly based on ability to be compressed or squeezed.
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Substances that cannot be compressed are called hard materials While soft materials be compressed
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HARD MATERIALS ARE TOUGH TO BREAK WHEREAS SOFT MATERIALS ARE EASY TO BREAK
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  1. objects that are soft and can be easily scrachted  are known as soft objects
  2. objects that are hard and cannot be easily scrachted are known as hard objects.
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HARD MATERIALS- MATERIALS THAT ARE DIFFICULT TO COMPRESS.EG- METAL,ROCK 
SOFT MATERIALS- MATERIALS THAT CAN BE COMPESSED OR SCRATCHED EASILY. EG- COTTON,SPONGE
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