Engineering Materials
The molecules in a solid move

Back and forth like tiny pendulums
In circular motion
In a haphazard way
In a random manner

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Engineering Materials
Nickel in steel

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties
Improves cutting ability and reduces hardenability
Gives ductility, toughness, tensile strength and anti-corrosion properties
Improves wear resistance, cutting ability and toughness

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