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            Toughness
                            Explanation: 
                            
                                        
                                            
Toughness:
When a huge external force is applied on a metal, the metal will experience fracture. Toughness is the ability of a metal to resist fracture. 	The ability of a material to resist fracture due to high impact loads, is called toughness.
Hardness:
Hardness is the ability of a metal to resist permanent change of shape caused by an external force.
Brittleness
Brittleness is a property of material which breaks with little or no deformation.
 
                        
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            Geometrical features
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            Hardness
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